Do I have to use savings and retirement to pay child support?

I’m having trouble paying my regular child support because my work hours were cut due to Covid. I work for a computer company in Chicago and we can’t get supplies in from overseas due to the lockdowns and transportation delays. The income reduction is definitely not my fault or choice. My ex knows that I have a fair amount saved in the bank and in my retirement account. She wants me to pay the regular child support payments with that money. Says if I seek a reduction or stop paying the support she’ll let child support know I have these funds. Am I obligated to pay child support out of my savings and retirement? I thought the support amount was based on your income only.