It all depends....being polite every now and then...not bad...like once every two weeks. But if you appear to be trying to please her (whether intended or not) then she will walk all over you. There isn't a rule that covers all interactions, but by being nice less you are actually giving her the opportunity to realize what she has given up. Plus it is easier to be a little dark then trying to be pleasurable if that makes any sense.
If you really want to give her what she wants...100%...listen to what she has said. If she had asked for a new car, a vacation, or a new wardrobe....I am sure you would have given it to her. Now she is in a way asking for space from you....so you should give it to her. With that space comes the reality that you are not going to be her enabler anymore....the support , love, and security that you represented for so long needs to disappear. Like the song says "You don't know what you got until it is gone"