does she ? where to go for some top shelf porn stars?

I've not seen anything about Riley escorting but to answer your other question, all you have to do is search here and on the ad board.  There are several agencies that offer top notch girls: TLC, Pam Peaks, the Haetara Agency, Platinum Providers, Lourdes (aka Lita Chase), and a few others.  Some of the agencies are better than the others and if you search here you'll find out more about the agencies.

Also be sure to check the reviews if you're considering a particular girl.  If there are reviews of her on this site, that can give you some indication of what you can expect if you set up a booking.  Just remember that it's ALWAYS YMMV.

Not sure if she is available, but check TLC and myplatinumprovider they have a great utr selection.

Any list of utr porn stars include Polish star Envy?  I'd love to meet her.

I know she posted on her old twitter she didnt. I think she made reference to saying she didnt when the Bibi Jones and Digital Playground "topic" came out into the open public last year. But you may wanna check the agencies listed in this topic to verify such?