Her chances are much better than they were before you decided to do that. It wasn't careless. It was selfish and dangerous.
What would you consider to be an acceptably low risk for of getting HIV from an partner who didn't disclose the information until after they'd had sex with you? Would you be okay with it if you only had a 3 or 4% chance?
Yes, your saliva carries the virus.
Get her tested for anti-HBs. If positive, then she is safe from HBV because she is immune to the HBV you are carrying.