Whatever she was, a drug user or an HIV +ve. It has nothing to do with HIV transmission during the situation you described. HIV is transmitted only through unprotected anal and/or vaginal sex when we talk about the sexual routes of transmission. Your risk never existed.
You had the same risk as anyone else who touches a bandaid or someone's cuts when they shake hands. Zero, otherwise we would all have it because everyone gets cuts and touches other people's at one time or another and probably a few times every year. HIV is effectively dead in air so can't infect, so it is time to move on from HIV and back to your normal life.