Hi Clare, I understand your frustrations - I still get this

.
You are right about the routine starting at 7am, but the others are also right in saying at she is refusing her 7am feed because of the 5oz 5am feed. DS wakes at 7am every morning and I leave of feeding him until 0730, to give him a chance to wake up and stretch (I can also fit my coffee in here

). I have heard of others doing this as well.
At this age DS was waking twice in the night for feeds at roughly 2 and 5am. I was only giving him no more than 3 oz at each feed. Then when he went to just one feed at approx. 4am I still left it a 3oz max.
I am sure I have read somewhere if she takes a full feed at 5am then the 7am feed is a top-up feed, then you start as normal again in 3 or 4 hours.
Are you on a 3 or 4 hr EASY? DS was REALLY playing with his bottles at 14weeks and it was very frustrating, I followed him for a day or 2 and saw he was pushing himself to 4hr EASY. I was trying to feed him when he was not hungry, he dropped a night feed soon after.
EASY is a guideline, we usually do EASA throughout the day.