Tell me ladies, how do you co parent? My daughters father lets her run a muk and at my house I like for her to learn discipline and that she can’t get things her way all the time

I need some advice mommy’s! My daughters father and I had split while she was 7 months. She lives with him but we have joint custody. It’s a struggle getting her to my house. She flips out every time. I get she’s comfortable being there but it makes me so sad. Sometimes she tells me she’s mad at me. She’s 3. Her father and I don’t have a very good relationship because it seems as though he can’t get over the break up. He brings our daughter in the mix. Looking for some advice, tips? I should pro...