Child support in Indiana

My ex and I make approximately the same in income in the state of Indiana. She is attempting to raise my child support. I have our two boys one half of each week throughout the summer, with a full ten days in the middle for vacations.
During the school year, I have the boys every weekend from Friday to Sunday for six weeks, then have them Mon-Wed for six weeks, but not for overnights on the Mon-Wed schedule because my ex feels “they should be home on school nights”. As if I live in a cave with a dragon or something….laughs…

I have reason to believe my ex has recently came into some money, i.e. an inheritance or gift.

Is that something that she would have to claim as income?

If so, how would I go about verifying she got it?

Thanks for all you help,