Turning 4 and still poops in panties every single time

Been working with my daughter for months and months and months now and she still poops on herself every time when she knows to go in the potty. She pees in the potty every time and has for a long time. No pull ups. We have to buy underwear constantly because she ruins them all the time. HELP. Also, she still takes a paci constantly and throws fits for it.