She's realizing that "Daddy's" aren't just for T.V....?

This is normal for the type of situation you are in. I don't suggest a therapist, she is much too young and if she has not suffered from any trauma, you can solve this yourself. You should just talk to her about it, explain that its okay to love your boyfriend, but he isn't her dad (yet if you plan on marriage) She just needs some guidance, because she doesn't know any better yet :) good luck