Originally Posted by kitten_Val
She was just telling you it's enough. Riding horse should not be just hard work all the time. They have limits too. If you feel she's really tired then just give her a break and do something easy, something she knows for sure: just walk around or may be even it's time to finish the lesson.
BTW, if the horse rears I wouldn't back it. It may start rearing even more.
I didn't mean LITERALLY backing her up, I meant back up what you're doing and go back to something you know she knows to get her confident in herself again, then try the turning on the haunches again. This is also why I said to get her moving forwards again, so that up isn't an option...I do agree that half the riding should be fun for the horse, the other half educational and lesson like.