Hello everyone, experienced moms, please help! The baby can't go potty…

Hello everyone, experienced moms, please help! The baby can't go potty on her own, although she has loose stools. She cries and turns red, I see that it hurts but she can't push it out. We have to resort to extreme methods when we're at our wit's end. I give her Duflapak, but it doesn't help. What should we do?