Help with identify what’s wrong with baby chick

Hi everyone, have a baby check that is about four weeks old. She was doing really well in the beginning, but wasn’t growing as fast as the others. I was worried that she just wasn’t getting as much food and water. She keeps trying to stand but falls forward. . I’m not sure if this started happening because the other chickens might have trampled on her since they were bigger or if this was a birth defect, but she was walking just fine when we first brought her home. I have her isolated and trying to feed her food and water, but it’s hard for her to lean forward to dip her beak and water. Is there anything we can do or what might be the issue?