Reddit reviews I Can't, I Won't, No Way!: A Book For Children Who Refuse to Poop
We found 1 Reddit comments about I Can't, I Won't, No Way!: A Book For Children Who Refuse to Poop. Here are the top ones, ranked by their Reddit score.
You might want to try some books on pooping in the potty, not just vague "I'm a big kid and I use the potty" books, specifically ones that talk about pooping. These two are both really great for getting kids to poop on the potty. If you can't find a book that works, I'd suggest making a social story.
https://www.amazon.com/Cant-Wont-No-Way-Children/dp/1466453737/
https://www.amazon.com/Wheres-Poop-Julie-Markes/dp/0060530898/
As you said, it doesn't sound like bowel control is an issue, and since she's been peeing for a year it sounds like the toilet itself isn't a problem either. You could also try bribing her with stickers or toys, but I babysat for a woman who did this with her kid and he started pooping just a tiny bit at a time and demanding a toy after every little deposit.