J.S.
REWARDS! That's what has worked for us. Like your daughter, my son had the pee thing down, but still doing poop in pullup (at night) or underwear during day (YUCK!) He loves Matchbox cars. We told him everytime he poops on the potty he gets a new car. That has been extremely motivating! We rewarded for pee in the beginning too (3 jellybeans) and after he got good at it we stopped rewarding. We told him "big boys pee on the potty and you are a big boy so you don't need the jellybeans." A little fuss at first but no accidents. I know the same will be true with poops once he's really used to it. I know a little girl who's day care provider bought a special doll for her. She could only play with the doll after she pooped on the potty.
Good luck! Remember they don't go to college in diapers!