M.W.
Seek advice from an attoney. It depends on the amount of the money which court has jurisdiction, so you are wise to get help from an attorney.
I hope you had her sign a contract, promissory note, or some kind of paperwork. If not, maybe she put a notation on the check that bounced. Make sure you take all your documentation to the session with the attorney, most will do an initial consultation for free.
Sometimes, just a well written demand letter from an attorney is enough to get people to pay up, and it doesn't cost you much.