I'm sorry to hear this. Have you thought about getting Sasha a playmate? Since your cats have a quite a large age difference it might be a good idea to adopt another cat that's closer in age to Sasha. I also think that a male cat would be good because having too many females could cause problems if they all want to be the alpha cat. Most males are more easy going. I currently have 4 males and 2 females and luckily they all get along but my oldest cat Storm who will be 11 in Jan. can sometimes get very cranky. Sometimes he just wants to left alone. Good luck.