Poop in the Potty

Peri has been wearing big girl underwear since the fall. Still wears a pull up to bed and still has accidents. Such is life. But she won’t poop in the potty. Refuses. She’ll stand there and know it’s coming and I’ll yell “let’s get to the potty!” but she’ll scream the entire way there. She did fall into the big potty a few months back, so maybe it’s left over from that? I’ve bought her a Dora seat, carried her little potty up the stairs and down the stairs, bribed her, threatened her. Nothing. Any advice welcome...