Hi honey
Just caught up on other thread and this one, glad things are beginning to get better for you. I was beginning to be convinced it was just that she needed less sleep, but I guess you have to assume otherwise until you've tried every avenue, and you certainly have done that.
Stick with the fixed routine it does seem to be working and it did before for short burst's.
Keep in mind too that she is slap bang in the middle of the first nap refusal age range, when lots of LO's go through spells of nap refusal for no apparent reason, i know Lily did!
Hope 'your' doing OK too.
Love Nik x