You can feel her leg and see if it reacts to a light touching… then move to a firmer pressure to locate the area that is causing her pain.
I would suspect the problem isn’t in the knee if it still is that active…check the hoof for anything cut…..I don’t wrap a joint unless I believe it is part of the problem, but if you do have to wrap it ,…Read more

Do not mix him with the other females all at once. They will attack him. If you want to breed bring her to him but keep an eye out. If shes ready you will know. Wouldn’t try until hes about 8 months or so. Some people say six so its up to you