Well, my guinea pig died...?

and i took everything out of my room of hers and cleaned it. this is really sick but when i took her out of the pen she was really stiff but still a little warm, and actually my grandma did it thank god and after that i disinfected my room. what else should i do to clean my room? i don't want any of those germs and i think she died of somthing other then old age, could you tell me some possibilities? my grandfather checked on her at noon and i found out she died around 5:30. what could she have died from? thanx i'm really thankful for it!