The sneezing does concern me...sounds like maybe it's myco (loads of rats are infected with myco) some don't show symptoms, others cough/sneeze. Eventually, if it is myco, it will take her life but not for a long while yet. I hope you rehome them with ease, but if you keep them, they live something like 2-3 years so it's not a huge burden...
[Spock]I have always been, and always shall be, your friend.[/Spock]