This is coming from years of observation (and a couple semesters of psychology), so it's not really an expert opinion. However, in this case, I would try using some other gesture (no, not the finger) to get your message across. Perhaps like simply shaking your head if you're a ways away from them. If you're closer, whisper vehemently in her ear. When she's really in trouble, use "the look" and perhaps you won't get the responses above. Of course, these are just observations, and if you find them trite and silly, pay them no heed.Alas try using it sparingly with a 2 year old.