Today i found my mouse laying on her side, i think she had a stroke what should i do? Plz Help!!!?

Yesterday she was fine. But just about ten minutes ago i found her laying on her side. Right away im like something is wrong with Gretchen. I took her out of her cage and she cant tilt her head normally. She was fine as a baby when i got her, she never had a head tilt. And she has a female partner that looks after her and she looks after. Right now her partner is laying next to her. I really dont know what i should do. I think she might p. Any advice, if so plz answer soon!!! T.T