my cat has problems with paranoia....i think!

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Our family has a cat she will be 2 years old come February. We have been her family since she was 4 weeks old. Since we have had her we have moved twice. The first move wasn't a problem, but as we prepared to move the second time she was very aggressive toward anyone and everyone who entered our house...even the people she would normally love on. Our second move we couldn't take her with us immediately, so she stayed with a good friend of mine. My friend slowly calmed her down a bit after about 4 months. Then we brought her back home. She is still hostile to my friend that took care of her for those 4 months and anyone else that comes in the door. She will attack people almost immediately when they walk in the front door. However, she is starting to chill out with my friend and now she is to the point to where she is almost okay with her being here but she still can't get near her or touch her, or Princess (the cat) will attack. Through all of this, she is perfectly fine with our family and very calm around us. Anyone here know anything about this? Have you had any experiences with this or know what to do to calm her down so she won't attack people. I hate having to lock her up every time someone comes over.