I agree. Babies will do their own routine until their ready to slip into yours. However if you did want to encourage an earlier bedtime- maybe start a usual bed time 'routine' with her then- like thats when you do bath, put on her pyjamas, read, have cuddles, swaddle/grobag, and lastly feed and put to bed (whether this takes an hour or 2 or 3- doesn't matter). That's what i have always done from 7pm- do the get ready for bed thing. Even now we have a similar 'routine' for our 2 year old as our 4month old. I've always just done it this way to separate day sleeps to night sleeps (cause DS1 seemed opposite at the beginning) in the hope they learn to sleep longer- which they both started to do from about 6weeks. But then this might just be a coincidence.

Just do whatever feels right for you's and let all the info people are telling you that you feel you don't need go in one ear and out the other.