I have 2 Female pet mice. One(Stella) i got about 2 months ago the second(Luna) i have only had for about 3 weeks, they didn't get along at first but they are buddy buddy now. Well Stella is still her normal self running on her wheel climbing around in her cage she is just fine, Luna was the same way until today she is now acting very strange i don't think she is eating much she looks thin Stella looks very healthy. Luna crawls really low to the ground and when u hold her instead of her running up your arm like normal she lays in the palm of my hand and lays her head down like she is tired she rarely ever come out of her home. And her ears are layed back. I dont know what to do im scared she is going to die. Any helpful tips?