Apparently it isn't true she is deaf/mute though it is still pretty incredible, especially with her riding bareback without any reins, so I thought I'd share it.
I suspect the spurs she keeps digging in to the horse's sides help though :0/ Looks a bit cruel to me really, can't be very good for the horse to go down that hard on it's hocks like that.
Just my opinion.
I wondered about that before posting though with the lack of reins (or anything really) or any protective gear and especially her riding bareback the horse could have thrown her any time it wanted if it wasn't happy (or generally, horses being quite random of temprement at times).