Sil Intentionally Let House Go Into Foreclosure. Need Help.

In my state legal separation is not a thing. My BIL left my SIL 7 months ago. He has been paying for 2 households and after everything is left with maybe $400-$500 a month to live off of. He has made sure that money is transferred into the joint account they used when they were together. Friday he received a notice from the sheriffs department at his job that the house would be up for auction as it is in foreclosure. He called the bank and found out that she has not been making the payment. Their agreement, which he had in text, was that since she wants to keep the house he would continue to pay for the home until she got a job and could cover it on her own. She hasn't worked in like 5 years. All kids are school age. I told him to check his credit and turns out she has ran up all the credit cards he thought were cancelled. In total there is like $15k worth of debt. To save the house he needs to come up with over $7k with fees which he doesn't have. He can't afford an attorney and doesn't qualify for legal aid because he makes entirely too much money. He has since locked down his credit as some of the cards were opened after their split and changed email passwords and she was deleting emails they were sending him since she still had access to that email. Anyone have any advice on what the best plan of action should be for him to try and get out of this mess?