You can't get HIV this way. The only way adults will get HIV is from unprotected vaginal or anal sex or sharing IV drug needles. That is it. Saliva has enzymes in it that deactivates the virus and air inactivates it as well. So, this isn't a risk. Even if she scratched a cut into your gum (which someone should tell her that is not in the least bit sexy!). So, this was zero risk for hiv.
Very strange that she grabs your arms and meanwhile put a finger in your mouth? Maybe not on purpose she scratched your gum. It's no risk for hiv, even when you began to bleed. If she was hiv+, her genital secretions were no longer infectious. A risk for chlamydia however