She looks like she's sound and moving along pretty darn well. I see no problem with continuing to jump her. The lesson horse I ride is about 18/19 and going on like a champ. When they are done jumping, you will know. They slow down a bit, are more reluctant, more stiff, tire easier, etc. Until then though, a good light work out will be good for her mental and physical health As a side note, she doesn't look like a wild or out of control mare to me, just an energetic horse with a rider who doesn't know how to slow her down and collect her up.