Does she has a hot spot?

Most people here keep their bp in 80 temp plus a hot spot 88 to 91.

I know there are some people do not use hot spot and keep their in 84 to 85 temp all the time.

Maybe you can try to get the temp up to 84 to 85. And see if she will eat.

Always keep the shy one in a smaller tube with no light and a hide. And always offer smaller prey. Have you try to get a rat pup leave it over night? maybe that will help.