The other participants in this thread are right - it is always advisable to ~first~ seek the professional assistance of a vet and then once a diagnosis is made, to seek information about that diagnosis. The internet is a wonderful place to research all sorts of things and it is a powerful tool. But it doesn't replace the advice and/or educated opinions of your veterinarian.
That all now being said, it sounds to me as though your little one may have bitten down on a bug or other somehow distasteful item and was suffering the ill after-effects. I have a girl who is an absolute bug fiend. If there is a bug of any sort in this house, she knows it, seeks it out and then destroys it with gusto. I have observed behavior very similar to that which you describe when she finds that some bugs bite or sting back - either on her nose or inside her mouth. If I were you, I would keep a very close eye out for any swelling or drooling. If either occur, make sure this kitty is seen by a vet. If not, you can check her mouth yourself by opening her mouth and visually inspecting - if there is an ulcer or wound or if her teeth are broken or otherwise there is something wrong, get her in to be seen.