What are my options?

My wife and I live in Wisconsin. My wife owes back child support. She didn't work through the year so she had no income. We filed jointly and received the EIC and child tax credit. The IRS app shows the refund approved but also said some or all of it could be used to satisfy a debt and that we'd be getting a letter about it in the mail. Obviously I want to file an injured spouse allocation but I'm afraid that since all of the refund came from credits ( I would have owed this year if not for the credits) that they're going to take it all anyways. I just need some guidance or words of wisdom to help sort this out and figure out next steps.