If you're really serious and not kidding, I say Big Red Flag. Like the other guys said, it will just be something else you want to do down the road and she'll give you the same ultimatum. I know, been there done that, my first wife wouldn't let me do/buy anything, plus after 9 years of marriage I caught her cheating. Divorced her *** in a hurry. I'm married again, for 3 years now, and she has No problems with Any of my hobbies. She's actually quite enthusiastic about them.
In any case if it is true I am very sorry to hear that,,, really sucks
Good Luck!!
Joe