I need to know if this suit would be civil, criminal or both, and where to file.?

Your best course of action is to sue her in small claims court. What she has done is criminal but you would have to get your local D.A. to file charges against her. If they suggest that you sue her in court, that requires a lawyer and you have o pay him. If you sue and win, and she doesn't have anything, now you're out the 7000.00 plus another 3000.00 for a lawyer. If you file in small claims you can represent your elf. But I must warn you, have all your facts straight. The matter of her slandering you isn't anything the courts care about, so don't even bring it up.