What are the consequences of check forgery (under $50)? Is this considered forgery:?

My husband opened a checking account w/ my 16 yo stepdaughter for her to keep her money and carry a debit card. She was instructed to NOT write checks and not give anyone access, especially since custodial parent (his ex wife) nearly got into trouble years before for check fraud. Long story short: the account ends up being overdrawn from a $44 check written for pizza. Turns out custodial parent wrote the check and signed my stepdaughters name. My husband closed the account and confronted his ex. No apologies or anything...she just said she would pay it. If she doesn't, what do we do? It will probably be $70-$100 with fees and all. Should we call the police and report it if she fails to pay w/i 30 days? You would think that she wouldn't want to ruin her daughter's credit before it's even established, but I wouldn't put anything past this woman. I don't know if it's considered forgery because my stepdaughter knew about the check, but didn't write it. Also, she's just a minor. What's our recourse?