Smile and nod and let her do what she wants. It works out best for everyone.
And whatever you do, don't do anything that may require hand surgery the week before your wedding (like pop a tendon while playing flag football). While it may be funny years later, at the time she will not be amused. Yes, I speak from experience.
If she asks for my opinion do I say "whatever you would want, I want?" Or how does that work?