I am going to say the opposite to the others.
I was puzzled by the comment that solids just replace milk before 6 months...
I have to bf and cannot consider formula (milk allergy). All my three have been bf, and only in the case of my latest has the advice been to bf only up to 6 months. I was delighted - I hate weaning with a passion, all that orange gunge, yuck. However, like my other two, his weight gain tailed off at 4 months or so, and I was advised by HV to start solids. Yes his weight did pick up. I was very disappointed not to be able to bf only to 6 months.
Don't know why I droned on about that really, I suppose just to prove I do have some experience and didn't rush into weaning, lol!
I think the problem is usually that the last few feeds of the day are not very satisfying due to your tiredness and low milk supply. So I would recommend a small amount of fruit and baby rice before her bedtime milk feed. That will mean she would hopefully wake for the next feed later and you will have more milk, thus making the subsequent feed later.
I really don't see the value in giving up solids at the moment. You will have to reintroduce them anyway. Perhaps if you always try to give the milk feed first you will know she is getting enough.
Is she in her own room? Mine is 7 months and not in his yet (as he doesn't have one) He wakes up a lot in the night and I think it's because his sleep is getting lighter and we wake him with our snoring/coughing etc. I am not sure he would really be waking so often for feeds were he in his own room.