Not sure if this helps, but I just went through this with my daughter (7 days ago) she is younger but she has been pee trained on her own accord since last Christmas, about 6 weeks before turning 2.

We introduced the potty to her to have her comfortable with it but I wasnt ready to train her so I hadn't prepped/taught myself how to encourage poo training so we left it cause she would poo in her pull up at nap time and just before bed. I figured she was still young and had time. WRONG! What a waste of time, all we were doing was teaching her that i t was okay to poo in her pull-up and bedroom. A friend of mine gave me a link to the 3 day method, first step was I got her to toss all her pull ups in the garbage. Gone cold turkey.....I didn't think it was working because she still poos in her panty but I have since learned that she is either constipated and/or afraid.
We did the sticker chart on her bedroom closet so she can see it. If she wakes up with a dry and clean panty she gets to put her sticker on the chart herself and one on her hand. I got her to repeat after me that "my panty is not my toilet, my bed is not my toilet" it has helped. 4 days now waking up with the same panty she went to bed in. We went out and bought her choice of panties and after her bath they all get laid out for her to choose the special ones in hopes of them still being on in the morning.

My problem now is getting her stool softened up to give her comfort in knowing she can do it