I wish I had an answer for you. It seems like you have tried every way you can to talk about it or initiate it. Has she ever been a victim of abuse or assault? Many times that "freezing" up can be a way for women to feel safe. Like controlling our sexual lives means no one will hurt us. Its just a thought. More importantly- Is is a deal breaker? You have only been married 6 months and together for two years. What if she never changes- can you live with that?