You have 2 problems here, both are with the legs.
1. The timing is wrong. She is bringing the right leg up with the right arm, and the left leg up with the left arm. Thats probably why it looks off. You don't walk like that. Especially not with that type of gait.
It should be right arm with left leg and left arm with right leg. Search this site for walking animations to see what I mean.
2. Shes bending her knees way too much and bringing them too high. With a casual walk they should not be so exaggerated.