It depends. Sex is a part of life at what part do it play in her life. I hate to play devils advocate but occupational sex is a part of our society in these times . Im not saying this is the case but something wrong and the outcome is not good.    It looks like she need a new job. Try something spontaneous and date her again.If this dont work you either need medical or some investigatory help. But get your facts straight no Witch hunting. 

God Bless