Thanks all! I'm so glad I didn't settle for some of those other horses we considered. It was so worth it to wait for her.
To answer your questions - we will bring her home as soon as we get the results of the PPE. Not sure when that will be, but hopefully soon. I should hear from the seller tomorrow about when she can schedule the vet.
She does not have English training so there will be an adjustment period. I spoke to my coach about it and she says she's confident we can make it work. She's transitioned several Western horses to English before, so we should be able to do it. I personally like a horse that neck reins so I may continue to ride her with a loose rein. But if my daughter is going to ride her, she'll have to adjust so we'll see...
The guy riding her was a very tall man and yes, his legs are very bouncy. He rides barrel racers so I think he likes them to walk at a pretty good clip. He may also have been doing that to keep her lively for the camera. However, both my daughter and I rode her at all the gaits and she did not require constant nagging. Basically, you put her into gear and she stays there until you tell her to go to another gait. We both found her pace at the walk to be perfect - not to fast, not too slow. Overall, we found her to be an easy horse to ride.