You're at risk for gonorrhea, warts, chlamydia, herpes and syphillis. There is a theoretical possibility that she could transmit HIV to you, but it basically involves weeping sores on your dick and in her mouth.
You risk STI infection in any sexual encounter. A respectable escort should keep herself up-to-date with STI checks, but she's obviously sucking a lot of dicks without condoms. It's kinda what she does. Buyer beware.
Having vaginal sex with a condom still puts you at risk for crabs, warts and herpes. Crabs are treatable, warts are an epidemic (regardless of whether one is a sex worker, most adults end up with genital warts whether they know it or not), and herpes is an incurable nuisance.
Personally, I disagree with Unabear. Respectable escorts (and they do exist, regardless of people's moral concerns) have to take care of their health and their clients' health because it's how they put food on their plate. An escort who's covered in herpes sores and has crabs falling off every pube is not going to go far in her work, and an escort who has a history of giving her clients diseases is not going to go far either. If she insists on condoms that's a good sign. Condom-free oral is a bit of a red flag, but that's a risk you both seem to be willing to take.
I can't speak for all sex workers, but I've been friends with a few and have heard presentations from sex worker organizations at different HIV and STI conferences. The above is what they've all said.
But, as always, buyer beware.
