Scout... I don't know where to start... - from the length of this reply you'll understand why I couldn't do it earlier !
I'll write my thoughts - please don't take any of them the wrong way, I am only trying to help (which I hope I will )
BTW my own DD is 7 months old. I have a DS who is 2 yo. I have read CLBB cover to cover several times, I think the book is very useful and I have used it with my kids, you will notice that some of my advice comes from knowing it so well.
Sleep :
You don't say if she has been a good sleeper in the past (you say she has become worst)- I am presuming she has been OK but not great ??
What do you mean by settle ? From what I read she seems to be unable to settle on her own... Singing to her is fine but besides the hairdryer, do you rock ker ? does she have a dummy ? - those 2 things are (or can be) sleep associations. It is "better" if you can void those and let her settle on her own.
I am not a great fan of Dr Christopher Green but I just read his book this week and he says that control crying (CC) can be done at 6 months. If you go down that route, please do it properly for EVERYONE involved ! You can find out how to do it from his book (don't need to buy the book it's on page 153 of his book called Babies). He also makes an interesting point. It is much easier to improve babies' sleep when they have been decent sleepers before, it is much harder to teach toddlers to sleep properly if they have never done so (according to him, some toddlers never sleep properly) - so I think you would do her a service by guiding her through a "sleep programme". I think she would benefit from sleeping well (that includes feeding well).
I have the impression that your baby knows you and your husband too well. She gets what she wants. I am all for listening to your baby and letting your baby give you cues but it seems that she is a bit confused ! At the risk of offending some mums, you need to toughen up a bit! It may only be needed temporarely.
Lucky me, I have never had to use cc but I do have friends who have and were greatful for the results because it has improved things greatly. I have read one or 2 mums here say that it didn't work with their child.
Also, don't assume that CC takes weeks to achieve (in difficult cases I hear that it does) but in the ones I am familiar with, the baby was sleeping much better after 1 to 3 nights !
I think your daughter needs a longer lunchtime nap - 2 hours not 45 minutes. It is VERY common for babies to wake after 45 minutes, what you can do is go in and re-settle her with a cuddle and leave the room. She should go back to sleep - she may not the first time you do it but she will the next day. I remember vividly a mum several of us supported last year because her baby would not settle at lunchtime... she was posting while the baby was crying and she managed to sort it out in 2 days (she was keen to do it).
I won't say that she shouldn't be eating during the night at her age but I suspect that if she does it is because this is how she wants to settle and because she may not be getting enough during the day. Hence, in that respect I find GF very useful. Has she ever slept from 11 PM to 7 AM with no wakings ? If she has then it probably isn't hunger. 2 feeds do seem quite a lot during the night IME...
A personal observation from both your posts : you say you are very busy. I think you need to give you and her a break for 3 or 4 days to help her sort out her sleep.... meaning not so many outings so that she can have her naps and she doesn't feel that you are in a rush - babies are very sensitive to this.
Food : first of all you can go back to work and continue to bf, I do. I express milk after her morning feed (I empty as much as I can), when I get back home I feed her and again empty the rest. All of that is given the next day at nursery. If there isn't enough I give her a bottle that's actually happened twice only. It is better if you can express milk at lunchtime (it does help in keeping your production going efficiently) but (for me) that's not always possible.
I don't think switching from breast to bottle will sort out her sleep if you think she is getting enough breast, the problem isn't there.
DD had accepted the bottle wen she was very young and refused 3 days before she was due to start nursery at 5 months. DD gave her a bottle of breastmilk 1 morning (when she was very hungry - she refused it for 3 minutes but then she accepted it, he gave her a bottle another 2 times during that day - NOT ME - and we have never had a problem since) - I hope this may work for you.
As for solids, I would not worry too much :
- she won't starve herself - she really won't
- she is not even 6 mo - solids are not yet a big part of her diet and weight gain
- she may or may not be teething (DD is chewing on the beaker as well but not teething) - she might be hungrier tomorrow
- vary the foods, some swear by baby rice, both my kids hated it. DD is a small eater and will only eat 3 to 5 baby spoons (she has improved to about 8 in the past few days). She will eat more than those quantities with sweet potato and banana.... everything else is not really her cup of tea. She will eat carrots, apples, pear, courgette, quinoa but all in smaller quantities.
DS ate like a pig ! So I have 2 very different children. Do not compare your baby's appetite to anyone else's it's only going to worry you.
Nursery... DD sleeps really well at home and very badly at nursery (3 days a week). It use to bother me but it has not affected her mood or sleep at home. According to staff, girls usually dont sleep as well as boys because they are too interested in what is happening around them.
To summarise, tackle her sleep first. I would suggest that you read Gina Ford chapter on sleeping as it might tell you "where you have gone wrong" (if you know what I mean). Try to focus on her in the next few days in order to give her a good start at nursery. She will find the transition easier if she is well rested.
Last thing - don't be surprise if I am one of few people who will post to you on this topic...as I have discovered a lot of mums who use GF wait to see what I have written and if they agree they stay quiet , if they have more ideas, they participate.... it doesn't mean that I am the only who has an opinion or who cares about your problem.
99% of Mumsnet knows I'll participate/advise in the sleep threads - it's a topic close to my heart !!!
I do hope some of my advice is useful to you. I would love to hear how you get on and as I am on Mumsnet everyday (it's addictive) I will look for your posts if you want more advice.
All the best
Pupuce