As you say yourself, there is no particular reason to believe your partner has
HIVAcute hiv infection
Asymptomatic hiv infection
Chills
Early symptomatic hiv infection
Elisa/western blot tests for hiv
Histoplasmosis, disseminated in hiv patient
Hiv
Hiv infection
Hives
Hives (urticaria) - close-up
Hives (urticaria) on the arm. The details of what you have and have not done sexually are totally irrelvant unless she IS infected. If you're not willing or able to trust her confidence that she is not infected, then she should be tested. The two of you could go together and get tested by the same provider. If it turns out either of you in fact is infected (I would bet my house against it), then return to the forum and we can address the risks of transmission and how to lower them.
Perhaps most important, I wonder what this says about your relationship that you apparently don't trust that information from her. If you truly "care for her deeply", then you may need to analyze why the question even is on your mind.
Good luck--- HHH, MD