hi there
This sounds exactly like my DS when he wanted to make the transition from 3 to 4 hr EASY.
Can I ask;
1. Are you feeding her every 3 hours during the day? if so, Is she taking the same amount from you or acting like she is not hungry?
2. Is there anyway you can put her down for a nap as soon as you see her cues, my DS can only stay awake 2 full hours, so I make sure I have him swaddled in his cot after 1hr 50mins so he can wind down for 10 mins.
3. Apart from being hungry during the night? Is she teething? Cold in her bed? Or kicking covers off? and waking at the other times?
Around Christmas my DS was the same age as your LO he was playing with his feeds and getting upset because I was following his 3 hour routine and he wasn't hungry, at the time I put it down to a cold bug?!

This went on for 2 weeks. Eventually I decided one day to follow his lead and only feed him during the day when he was hungry - I wrote the times down and over the course of a few days it transpired he had put himself on a 4 - 41/2hr EASY and took more at each feed. The only problem this caused was that she usually (on his 3 hr EASY) had a nap a couple of hours before his official bedtime, on the new 4 - 41/2hr EASY he was missing this nap and was EXTREMELY cranky and was over tired for his bed/last feed at 8ish and his bath (not in the order). Over the last couple of weeks I have had to adjust his routine to make sure that he would be tired enough for his last nap, even if that means waking him up from his afternoon sleep a little early so we can fit another one in.

His normal day now looks like this:
0700 Up
0730 Eat0800 Activity
0900 Sleep (although today he went for 3 1/2 hrs!!

another first)
1030 Activity
1130or1200 EatA
S
A
1600 usually next E or thereaboutsA
S
A
Bath 1930
Eat 2000Sleep 2030 in cot (usually awake with winnie the pooh light show on)
This is only 4 feeds in a day, I tried a D/F once and he still woke at the same time in the night - so I never carried on with it.
After reading other sleep posts it seems that a good day routing sets the standard for a good night one. My DS has slept through the last 2 nights, after having 2 weeks of waking every 20mins to 2 hrs - there is light at the end of the tunnel for us all.
