I just want to make the observation that lots of folks have had STDs in the past. A lot of them are cureable, just as hey were in my youth... The world changed with HIV but couples happily played unencumbered prior to that. So just because she "had an std in the past" does not mean she has one now.
Now you are saying that this provider (std status unknown) is having BBFS sex. It's not smart for any provider to do this (and you'd think that, having been through this once, that she'd be morecautions) but we all know that BBFS happens. The adults here know the risks. I have seen reviews where the offer of BB was made. I think that is the proper place for such remarks.