My cat is 4 years old. She was found at around the age of 2 weeks or so wiht her brother, abandoned by her mother. She was taken in a fed with a dropper and has now grown into a healthy cat. I am wondering if her demeanor comes from her unfortunate beginnings. She is very defensive. She will bite for no reason especially on your hands. The biting is quite obessive one cannot ever really pet her. She also does not ever purr. I am just very concerned about her and know that she could be so much more loving. Is there anything I can do?