She can do what she wants and operate her business how she likes jsut like any of us can decide to see her or not.
But you could always call the cops.
"Hello Police? I'd like to report someone for illegally recording me."
"Uhmm, okay. What happened?"
"I went to see this escort and she has a camera beside her bed and didn't ask me if it was okay to record our session."
"So let me get this straight. You went to see a lady who you had a) communicated with to obtain sexual services and b) paid for sexual services and now you are upset she recorded the session?"
"Yes!"
"Would you be willing to sign a statement saying this is true?"
"Of course."
"Okay well then come by the station anytime. Oh and by the way, bring your toothbrush, you will likely be staying here a while."
Cheers
J