Kids are best imitators

My daughter is 2 years 9 months almost. She is getting potty trained. I can say she is almost there but there are bad days when she just resists and goes back to her diaper. We try to scold her, coax her and tell her to use the potty. This morning i was changing my son's diaper. She comes to the room and yells at him
"Did I not tell you to use the potty? When will you learn?" I was awed. My son is going to be 4 months in couple of weeks.