K.P.
2 1/2 is still so young! dont push it and dont shame her for not using it. you may try a reward system. My daughter was later than her friends on this developmental milestone and she is very smart as well. i would always have an extra pair of clothes with me and pullups until she was 4 yo! When she does use the potty, reward her. when she does not, just let her know that it is too bad she did not make it and maybe next time she will. Dont worry about it, as this is totally normal for a child her age.