Hi SusanAM
Congratulations on your new baby! Those first weeks are not much fun, are they? Only five weeks, but it seems like an eternity. You are doing well and obviously want the best for your daughter.
Just to let you know, we have followed modified GF since ds was two weeks old and have been pleased with the results. Ds has been sleeping from 10.30pm - 7.00am from 8 weeks, and from 7.00pm - 7.00am from around 4.5m. I don't know if he would have got there on his own, but he is generally happy and yes of course "contented"! However, we have got there despite thumbing our noses at some aspects of the book...
You say she has been quite happy until the last two days. My first thought is that the routine changes a bit at four weeks - if you have implemented this change, could it be that she is not quite ready yet? If you think this might be the case, I wouldn't hesitate to go back to the two to four week routine for another while - maybe a week/ten days and then give it another go.
It could also be that she is experiencing a growth spurt. GF mentions this in the book - her advice for dealing with it is to express milk at various points during the day to increase your supply and to store the milk you have expressed and use this to top up if your baby seems to be experiencing a growth spurt. I know many people on this site have followed this advice to good effect. However, I dropped the expressing fairly early on, as I just could not fit it in unless ds followed the morning nap to the second. I was also not happy about giving him bits and pieces of expressed milk, as I didn't feel he would necessarily get the right balance of fore and hindmilk (that GF herself says is necessary) unless he was fed from the breast. So my advice if you think she is experiencing a growth spurt is just to feed her more often until she's over it.
I don't have any advice to offer on "cracking" the daytime naps, if you are already following the advice about the dark, quiet room etc. I would say it is best not to leave her to cry whatever GF says - she is still so young. As other people have mentioned, she could be crying for a number of reasons hunger, wind, tiredness etc. so I would always go and investigate after a couple of mins of sustained crying. Maybe she just needs a little, quiet cuddle to settle down.
We have found GF very helpful. We have had the predictability, free evenings and undisturbed sleep that we had hoped for, however, this has happened without necessarily following it to the letter.
Here are some general observations I would make based on my experience of implementing
GF which I hope you may find somewhat reassuring.
Feed them if you think they're hungry - regardless of the routine
Don't let them cry for more than a couple of minutes - regardless of what GF says
Don't even think about starting until your baby is going three/four hours between feeds, however, there are some useful tips to ensure they have a decent feed each time to try and encourage a longer interval
In order to get the full picture, you need to read not only the summary routine, but also the more detailed routine plus the feeding and sleeping sections. The information is quite spread out in the book, which is difficult to contend with, especially for a sleep deprived new mum. If you can manage it you will see she gives far more scope for what she calls "top ups", i.e. extra feeds, (and other changes to the routine for that matter) - I would exploit these as much as possible if your baby suddenly doesn't seem to be as happy as she was.
Regardless of the dire warnings in the book, it is possible for your baby's schedule to vary from the routine without compromising other areas. For example, my ds has never slept as much as the routine says during the day, however, this has not impacted his bedtime routine or his sleep at night at all.
If your baby is not ready to move on with the changes in the routines at the times she suggests - don't worry, just move back to the previous, "younger" routine and try again in say a week.
I don't believe any baby, even one who is generally happy and contented in the routine, will follow it every single day, some days will just go to pot, for reasons you can never fathom. In these situations, I would just feed or let sleep as necessary, stick to the bedtime routine, and then stick to the morning wake up the next day, and try again.
Never managed not to have any eye contact with him when putting him down!
Don't worry about always putting him down awake like she says - it just isn't always possible. My ds would fall asleep at the breast every night, since we have moved to bottle feeding he settles himself down after his feed.
I think sometimes if you read these boards you get the impression that you have a nightmare of sleep related problems ahead of you unless you follow a proactively preventative approach (such as GF). It has taken me a while to realise that the boards give a slanted view in that people only post for advice when they have a problem, so reading them you can get the impression that it is all problematic and difficult. Of course, you don't see all the people who haven't had problems. So try not to worry about storing up problems - it may never happen.
Use your common sense and instincts - the clue is in the title i.e. "Contented", if she isn't and you aren't, well, it is probably time for a rethink...
Reading back this note before posting, I see it is a big ramble, with little specific advice for your situation. I just wanted to reassure you that it is still possible to get some benefits for your baby and yourself from GF without having to resort to anything drastic or anything that goes against your instincts or makes you uncomfortable. These baby books are supposed to be a help and an enabler for new mums - if it isn't working for you or your dd, just give a rest for a while, maybe you could think about resuming in a couple of weeks or months, whatever makes sense.
hope the above is helpful and reassuring in some way in not coming across as patronising or unsympathetic! Not meant that way at all.
Best of luck