Dear Welcome to HCM We understand your concerns I went through your details. I suggest you not to worry much. In every probability you should visit a psychologist and narrate all the symptoms to him/her without exaggerating anything. Be true. Your sister may simply be behaving properly. The given description is not at all enough to make any diagnosis. If you require more of my help in this aspect, Please post a direct question to me in this website. Make sure that you include every minute details possible. I shall prescribe some psychotherapy techniques which should help you cure your condition further. Hope this answers your query. Available for further clarifications. Good luck.