I hope you're kidding, but if not here's my .02:
If you let her get into your mind, then she will have put a hex on you. If you don't, then she has failed.
You have the final control over your mind, not her!
If you believe that she has placed a hex on you that can affect your life, then you will begin to find ways to support that belief. Sort of a self-fulfilling prophecy.
Don't let her get in your head and don't let her get any deeper into your wallet! In fact, you don't have to listen to her at all so hang up the phone!