Her poop problem worries me too much. I do not know what to do, or how to start and look for what might help her. My baby is in pain. This is so sad watching her holding, and sometimes I beat her.
My 5 year old used to do that when he was 3 or 4. He had some really painful bowl movements for a couple days from something (cheese/not enough water?), and after that was really scared to go. Which, of course, made it even more painful because of holding it in. He did this for quite a while. We ended up giving him some stool softener for a few months so he could get it through his head that it really didn't hurt most of the time.