Yeah, that attitude over money probably won't stop when she see's new things. If she wants to re calc the CS, I'd just say "let me know" and let her initiate it. It can only be done every two years anyways and if it comes out to the same or less, good for you. Then if its a big deal you can always choose to give more.
M: 43 W: 43 Married 6 yrs. T: 7 yrs. Son 20, 18, 17, 15 yrs. (w/ Autism), 12, 10