After a meal take some books in the bathroom and sit with her. Be prepared to be patient and just wait... She will probably get agitated but tell her that y'all are waiting for her to have to poo. Does she have a little potty or just the commode? If she has a small one sit her in front of the tv around the time she usually has to go. Good luck

Tell her she cant wear her big girl undies until she goes potty on the potty, treats (fruit snacks), stickers

You could offer her a new toy or a fun day with her if she goes poop on the potty a certain number of times. That's how I got my nephew to start going on the potty. ☺ and make sure you're EXTRA happy about her going on the potty.