When I had to switch back and forth from breast to bottle my lactation consultant told me to make sure I kept using the newborn bottle nipples no matter how old the baby got. They have very small holes (low flow) so the baby has to work hard to get milk from them (the same as your breast). I learned that if my son got to use the larger nipples (my sitter mixed them up once), it was easy for him and he would choose the bottle over breast.
I also had a son who wouldn't eat breast or bottle. The dr. told me to keep his night feedings. He would wake up sleepy and eat more because he wasn't aware enough to fight me. Sounds strange, I know, but it worked. Maybe you could get your child used to the breast again by re-introducing it when she is sleepy. Best of luck. It will take a lot of patience, and hard work, but it is worth it. The mommas on here always have great advice too :)