Julie,
the movement is a combination of incredible reach and drive and not enough body length to accommodate that stride underneath her. She's actually sidewinding a bit which is probably not helped by the fact that she's moving in a large circle.

I'll check her out in the ring moving more slowly in a straight line -- down & back -- and see if she stays within herself in that type of movement.

Yes, she's a beautiful girl. Pretty, sweet and confident. I've always loved Weims and she's a very good one.

Jim