Imagine the shape she resembles at the moment her foot first touches the floor as the curved rail of a rocking chair and the wall she's facing represents the plane of the floor. In an approximate manner of speaking, she needs to rock from the end of the rail to nearly the middle of the rail before straightening her ankle, then her knee, all while continuing to rock to and slightly beyond the middle of the rail as she straighten hip hip and continues the sequence of the torso until she's standing.
So that's kinda what she should do, but she's doing things differently. Probably she tries to bring one of her body segments up out of the sequence's order, and that causes one of the segments below to cease the rocking motion and collapsing the rail's shape. That's going to be a carpet collecting experience 'most every time.