She definately need her stirrups shortened, and I read beofre that it was about a one time thing but just pointing that out. Also she is jumping at the horse and not with him. and at the canter she is pumping to try to get the horse to move which is making her back curl and her bottom to hit the saddle a little harder than necissary. Something that always helps me when im pumping is to take my seat away by doing a light half seat, then once i feel the horse is at a good pace and im not pumping i will relax and sit down again
The horse. Here is nobility without conceit, friendship without envy, beauty without vanity. A willing servant, yet never a slave.