Gonna need info if you want the right advice such as current weight first and foremost.
After that a description on how she is being fed.
Are you positive it is a female?
How often she is handled?
Right now all I can say is raise the ambient temps to 80/84 and based on the picture do not upgrade the tub size (this is not the time to do so since the animal does not eat)
breeder said it was a female, the mouse is being put in the tub and being left overnight til she eats. im going over there asap to get weight. she was handled every other day but not since she hasnt veen eating