Thanks for a not so useful answer show bizz
And was long to read
Basically, become autonomous. Do your own due diligence and ask her for a proof pic (specific hand gesture/phone number written on a piece of paper), vet her along the process. In doubt about her vibe, ask her an open question such as "What are your best qualities that make you a good companion to share a good time with?".
And remember, trust your gut feeling.
Next time, feel free to add the link to her ad in your 411 inquiry to make it easier for other punters to know who you're talking about.
Good luck !