K.U.
My guess is she really wanted what she wanted and was just testing them. Kids do that and it's normal - I think I would worry more if they didn't! I know that my daughter is generally very good too but sometimes when she is over-tired she gets really cranky, does not want to listen, and is more apt to have a meltdown over everything. She was also a bear for several days in a row a few weeks ago and ended up with a cold and an ear infection. Maybe she was over-tired too, or coming down with something.