Since the snake a- is still alive, and b- keeps eating and everything, they don't ever stop to think that they're doing something wrong. Sad but true.

The male I'm rescuing in a few days has a similar problem in that they were feeding him a medium rat plus an adult mouse, FT, once every MONTH or so! Granted, that prey is a bit large so he doesn't look underfed in the pics I got, but still... now I have to try and get him on proper prey size and a good schedule.

At least you have that girl now and can get her nicely filled out.