Stop copying/pasting posts from NCT.

What do you do when a child was fully potty trained weeks ago and come back with her pooping in her undies after a bout of bad constipation? My LO was completely potty trained before vacation a few weeks ago. MB said she just let her poop in her undies/Pull up (GRRRR) because she was constipated and it was the only way she would poop. Now fast forward 3 weeks she still won't poop on the potty! Even when I catch her "hiding" to poop she has a complete meltdown/temper tantrum and won't go near the potty.HELP! It frustrating! Sticker charts and the sorts don't work.