How much are you spending and on what? What is your living situation? Is your income enough to live like an independent adult? What exactly are you buying that she complains about? How long have you been dating? How do you feel about her(is she a serious contender)? Do you agree with her spending habits? Do you complain about her choices? All of these answers would have an impact on my advice. When I hear someone call someone else "spoiled" to me that means you are purchasing things that are luxuries and not necessities. Or you are purchasing luxuries too often. I know you are the one on this forum, but it sounds like she's more frugal/money conscious than you. she thinks you are a spendy pants consumer sucka.
But, generally, I would have a sit down and tell her it upsets you when she complains about your purchases. Ask her why it upsets her when you buy X, Y, Z. She might say she doesn't like that you buy X, Y, Z when she would rather see that money going towards A, B, C. Or maybe a little less Z and a little more C or whatever.
This could also be a wake up call that you two aren't really compatible. Like, you want a life that involves X, Y, Z and she wants a life with A, B, C.