Looks like she is holding them all crunched up and leaning forwards on the horse.
There is no saddle so there isn't a way to tighten the reins without her holding them.
It doesn't look like she's holding them crunched up to me, her hand is open and flat and there's no dark pixels under it to show the rein there, it looks like it's just a tight harness, possibly designed to get the horse's head to pose this way. I mean I could be wrong of course, that's just how it looks to me.
Looks like she is holding them all crunched up and leaning forwards on the horse. There is no saddle so there isn't a way to tighten the reins without her holding them.
It doesn't look like she's holding them crunched up to me, her hand is open and flat and there's no dark pixels under it to show the rein there, it looks like it's just a tight harness, possibly designed to get the horse's head to pose this way. I mean I could be wrong of course, that's just how it looks to me.