I'm sure if she was cooking something that surface would have been disinfected, I mean it's used to cook food that people EAT, if that isn't common sense than idk what is haha. But I wouldn't worry too much, also, you can't spread the virus by mouth until you've begun showing symptoms, so I'm sure you wouldn't have caught it from kissing her. Just try and keep your mind off it (i know how hard that is I'm going through all this "waiting for it to happen" rn too TT). But what always helps me is I go out and try and distract myself. I'll go for a walk in my university campus or watch YouTube videos. Anything to keep you comfortable.

<3 Best wishes~~~