Has something changed in here environment? room painted, new kid, anything that may have changed. has she mentioned anything that may have thrown here off? We are adhd'ers depend on structure and consistency. I was not treated when I was in grade school or high school.
One thing my school did do though was put me on a contract system and each day I had to have the teacher fill it out. It worked sort of. but I was still kind of hit or miss. It is a natural part of adhd for us to be consistently inconsistent. There were times I was awesome and in tune then the trap door would fall open. sometimes you have to step back and not force the issue see if it pass. Or maybe try finding something she like,s such as a snickers fun size bite as an example. Try tieing a reward to her homework, giver here a reason to want it done.

Also the school saying you should go in and sit with her. I do not agree with that at all, my father did that with me at the schools request and it cause me torment and grief from the other children, it followed me everywhere. All the school cares about is numbers and grades, but what about the child.