She hasn't acted like either of her front paws are tender at all, and as she is currently curled up next to the warm computer I lightly squeezed both just now to be sure. She drinks out of several different water bowls and even occasionally (when I'm not paying attention ) my own water cup and no matter what it's always the same with the twitching but she does not twitch at any other time - and I've been watching her carefully to make sure she doesn't. I am planning to take her to the vet if any other symptom at all develops and in the meantime will work on your suggestion of keeping a diary of the exact circumstances of her twitching - thank you for the suggestion