A few days ago Callisto started hiding under the bed and refusing to come out when I called. Then this morning she started her first heat and this afternoon she refused to come upstairs with me (she usually stays by my side all day) and when I came back down I couldn't find her. She was on the lower leval looking up at me and refused to come up. I had to go pick her up. Is this possibly related to her heat? shes never acted like this before.