Child support is based only on the non-custodial parent's income in TX, unless you have shared custody.
She could win the lottery and it would make no difference.
If your income is $10K lower, you are working full time and it's lower because of something beyond your control (as in, job was forever eliminated) you might get a reduction. If you quit your job for another that pays less, then no chance.
“There are those that look at things the way they are, and ask why? I dream of things that never were, and ask why not?”