My friend had norovirus last week but has been feeling better for about 2 days. we were at a gathering together last night, but i didnt touch anything and i had a kn95 mask on. how likely is it that she was still contagious or gave me something?

Norovirus (not Covid) is passed through feces or vomit. How you get it from someone is touching something that has been contaminated by the infected person and then touching your mouth or eating food by hand. The tiny particles of contimination of the infected person can also be on their clothes. People infected can be contagious for at least 3 days or even a couple weeks after feeling well.