If she alwaus has had such a good feeding response without experiencing long fast and does not seems to gain much weight I would suggest to have a fecal done but first I would re-sex her and make sure she is a she.
Well I know the size of the rats are good for her. He had her sexed by an exotic vet a few months ago.
1.0 BP VPI Pastel - Dante
0.1 BP Spider- Name Unknown (not shipped yet)
Hopefully another one soon!