Don't pay until after you get what you are there for, whatever that is. If she says she has to pay her "driver," let her know she can leave.
Lock the door, don't let her unlock it for any reason. If she does, relock it as fast as you can.
If she won't get naked until you pay her, it's a scam. Kick her out and call somebody else.
If she's riding with you (not recommended), don't stop anywhere on the way to or from. If she insists you stop, leave her there.
Pull the bedspread and blanket completely off the bed and throw them in the corner. They're likely filthy. If it's not warm enough for just sheets, crank the heat up.
Do your best to make sure she's alone and nobody is following her.
There are a number of threads on the site on this subject. Search for them.