I have had a hyperactive kitten for about three weeks now and brought a bigger Persian kitten yesterday. They did not get along my old kitten started to hiss and tried to pick a fight with the new one, I did not let them make any contact. When I woke up this morning I kept calling my old kitten to no avail, she usually greets me in the morning herself and demands food. When I found her she looked terrified and was limping. She refuses to eat ever since and keeps hiding in dark corners. I called a few people ( cat owners), they suggested that she was faking it. I don't know what to do now, Help please!