Hey, I dont have experience with animation, I just walked a couple of times across my room and tried to compare it 😀 It dont know what you mean that it doesnt feel balanced, to me it feels like its kinda stiff and I cant “feel” the weight of her when shes walking.
To me it seems that the step is kinda ending prematurely and that the leg should get more straight and reach a bit further before it touches the ground. Even when I walk really slowly, my leg gets almost straight before I put it down. And when I put my weight on it, it becomes completely straight as the knee gets locked. She looks like shes putting it down while its still bent and keeps it a bit bent even when her weight is on it, and it only becomes straight as she lifts it off the ground in the back. If your knee is bent with your weight on it, the muscles have to be tensed so the leg doesnt collapse. But when the knee is locked straight, most of the weight is supported by the bone. The arms also feel a bit stiff, but I dont know why.
Also when I walk “casually” like this, my leg is pretty relaxed when its in the air, and when I put my weight on it, I can feel the femur kinda get deeper into the socket at the pelvis. Its doesnt happen as much when I walk faster, because the muscles around are more tensed. But even so, when the leg is in the air, I can still feel it beight pulled by its own weight and then get pushed when I step on it. I am not sure how much of that is visible from the outside though.
Im not sure if this is any help 😀 Anyway, good luck.