Risk from a single isolated unprotected (or condom failure, one and the same thing) sex with someone of unknown health status is not very significant, but not zero either.
CSW's are more careful about their health because of their more frequent exposure, so there is a strong possibility that she was not infected. If penetration did not occur then, the possibility drops down to zero.
Having said that, you are not sure whether you penetrated or not, and the condom failed inside her or not, you don't know.
So what can be suggested, you should get yourself tested for HIV Duo test 28 days after your the incident to rule out the possibility of your infection conclusively. This is the only way to determine our health status.