Is she in season or is it some thing else?(please read)?

It could be her ovaries hurt- Or her back is sore. If she is bucking and not wanting to move, something is definitely out of whack- Don't ride her again until the Vet checks her for back or foot/leg issues. Being unresponsive is her only way of telling you "I hurt!" she can't talk, but by her body language she is being loud and clear- So you need to listen! If it is her ovaries, you will just have to be patient.Thats part of having a mare. I have found that a mare will give 110% when they feel good. Be kind to her, and she will give back to you.