My daughter (3.5) loves her dolls, princess toys (we don't watch the movies or shows) and using her imagination. Wha does she say when you ask her what she wants to be when she grows up? A doctor, like mommy

Or a cowgirl (depends on the day).
While we do not push the princesses, if she wants to play we do. We do not tell her the real stories (dead mommies, captive princesses, heroic princes etc) and we provide her with plenty of positive role models - especially in our immediate family and friends. SHe is 3.5 - it is more important for me to validate her interests and choices (within reason of course) and build her confidence. I think it would be impossible to totally shield her from princess stuff.