I too have OCD and would be more than willing to lend you an ear if you need to chat. Does your girlfriend go to therapy? If not is this something she would be willing to try? Is she on medication? Have you two thought about couples counseling to help you communicate better in regards to her illness? I just wanna give you somethings to consider. Also, see about get information about her disorder either online or books. A good website to go to is : http://www.ocfoundation.org/
or
http://ilil.essortment.com/obsessivecompul_rtyv.htm
or
http://www.psyweb.com/Mdisord/ocpd.html

These sites deals alot with OCD and OCPD. OCD and OCPD are not the same so try foucsing on OCPD articles to get as much info as you can. Best of luck to you and your girlfriend. Keep us posted!!

Jenn