I'll just leave my .02 cents here .....
In the same why you enjoy supporting her and helping her get though school she should enjoy helping support you and the family as a "unit".
It makes you feel good to know you can support her and help financially.....why deny her the same when she is able to do the same for you?
Being in loving relationship is about loving and being able to open yourself up to being loved by the one closest to you.
Man up and let her love you like she wants.....you'll thank me later!