Did she give you oral sex? You don't mention that, but if she has oral herpes, she is only infectious from her mouth.
You wouldn't get genital herpes from kissing or sex if she only has oral herpes, which is what you think she has.
There's a chance you could get oral herpes from kissing her, if you don't already have it. The IgG hsv1 test misses 30% of infections, so there's no way to really know for sure if you do or not, and 67% of people under 50 have hsv1. Chances are excellent that you've already kissed others who have it.
Most people with oral hsv1 don't get symptoms, so they don't know they have it.
I wouldn't worry about this. I don't know what is causing your symptoms, but your encounter was really brief, and she tested negative for STDs the week before you were together.
Don't let guilt take over here. Guilt doesn't equal risk.