What's her daytime routine? What's her bedtime routine?
I'd suggest an awake time of 2-2.5 hours with 2/3 daytime naps of either 2 hours or 90 minutes. This isn't always possible if you have a cat napper.
I'd try and stick to the following routine for a week and see if you have any success;
7am awake and milk
8am breakfast
9.15 settle to sleep
11.15 wake up and milk
12pm lunch
1.30 settle to sleep
3.30 wake up
5.45 settle to sleep
6.15 wake up and milk
7pm dinner (porridge and banana, nice and stodgy)
7.30 bedtime routine*
8pm settle to sleep
If you're not on 3 meals yet, I'd start with dinner, then breakfast and then lunch as you build up.
*bedtime routine is ideally, bath if needed, pjs, milk, sleeping bag, book and then bed. This removes milk from bedtime.
Re nighttime milk, try a dreamfeed if this doesn't just completely wake them up. If this doesn't work, set a time that you're not willing to feed before. At 6 months, I would say that 2am is reasonable, ie 6 hours without milk.
Depending on how solids go, I would night wean at 9 months if she's still waking up for food.