I went through almost the same thing. My daughter was great with pee a few months after she turned 2. But she wouldn't poop on the potty. I just left her alone and whenever she would poop in her pull-up, I would calmly say, "ooh, poo-poo goes in the potty". Then one day she just pooped in the potty on her own. From there, she would pee on the real toilet, but not poop. I think she liked her feet to touch the floor to poop! Anyway, once again, I left her alone and followed her lead. By then I was pregnant, so it was REALLY gross having to empty the potty, but whatever. Right before she turned 3, she pooped in the toilet on her own one day and never looked back! Ten days after she turned 3 I had my son and it was only one kid in diapers for me. She too, loves her brother but still gets jealous sometimes. I just give her special time with me and let her be my "big helper" with the baby. Next month she will be 4 and my son turns 1. My daughter thinks she is his boss and little mother, but it is better than when she was so jealous that I caught her hitting him when he was really small. Good luck to you and just try to take it easy. Your daughter will get fully potty trained. :)