Ah i missed that part. Even so assist feeding is not necessary at this point. I remember reading on this site about somebody whose BP had just come off a 280 something day hunger strike. The big ones can do this and it doesn't affect them like a hatchling. Assist feeding is the last thing you attempt to do.
To the OP i would just get a scale (in grams) and keep track of her weight, she will lose a little but as long as she looks healthy and there isn't any significant weight loss you should be good. It's breeding season and if she was a breeder she has other things on her mind (not food).