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.
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.