A mouse.
(Sorry! Couldn't help it...)
If she is tan, she's probably diluted on the c-locus with something like beige or chinchilla, and then again on another locus (such as Ay/*, red) that would wipe out what color the c-locus had left.
Depending on what her babies are (do you know the father?) and how well the pictures turn out, we could tell you for certain.
(Sorry! Couldn't help it...)
If she is tan, she's probably diluted on the c-locus with something like beige or chinchilla, and then again on another locus (such as Ay/*, red) that would wipe out what color the c-locus had left.
Depending on what her babies are (do you know the father?) and how well the pictures turn out, we could tell you for certain.