3 y/o won’t poop in potty 😒

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She will always pee in the potty, but won’t poop there. She just waits until I put a pull up on her at night or will even poop in her undies during quiet time 😑 How can I motivate her to poop on the potty?

The few times she has pooped on the potty I’ve jumped for joy and told her how proud I was, gotten super excited, given prizes....these things don’t seem to be motivating her anymore. I am feeling a little lost and frustrated.