My mouse is sick. Does anyone know what I could try to make her feel better?

The exact same thing happened to my hamster. I just made sure it drank alot. And kept it warm with a heating pad. I put a little bit of sugar in her water. And fed her oatmeal, she liked it alot. So maybe just give your mouse little oatmeal to make sure she's eating. Call your local pet store and vet. Even though it is expensive, if the veterinarian on the phone says it is serious, try to bring Bianca to a vet. Hope she gets better! ( Ummm...i really do because I am really sorry to say but when my hamster did this she died. But hopefully you will figure out how to cure Bianca before that happens. Good luck!!!