In 2015, I claimed my mother as a dependent and then filed as Head of Household. However, she made 5,368, which is over the limit, I think. What should I do?

This is for 2015 and I think my mom meets all the other requirements for me to claim her as a dependent but the income limit. I'm not sure what sections of my return to amend to take her off as a dependent and then change my filing status or should I just redo the entire return?

How much trouble could I get in if I just left it as it is? Jail? Fines?

Thanks