Abnormal behaviour of my aunt

my aunt is about 60 yrs old and from last 6-7 yrs she was behaving abnormally. 1.she takes bath many times even after touching her own hubby. 2.she never touches any other person,if by mistake such happened she takes bath. 3.even sometimes she stay nude within her full packed house even in the presence of hubby. 4.she also make her hubby compulsory to take bath if he touches anybody outside. I WISH TO KNOW WHAT KIND OF MENTAL DISORDER IS THIS, AND IS IT RARE PROBLEM OR SOMEWHAT COMMON AND IS THERE ANY SOLUTION...KINDLY REPLY AND GUIDE ME.

I'm not an expert, but it sounds like Obsessive-Compulsive Disorder (OCD). This is a pretty common disorder that can be treated with medicine, like Paxil. I don't know if the odd behavior goes away completely, but I think medicine and therapy can help her.