I think she's doing amazingly well. She is up there learning the reins, 'steering' the horse, and just having a blast. She's already trotting and practicing her positions which help with balance.
I hope this love affair continues. You can tell by the smile on her face it's something she enjoys. We finish one lesson and she's immediately asking when her next lesson is. I would have her do it every day if I could, just to see that smile. (of course, the mom in me also wishes she could be this focused on other things too!)