Oh dear lord - RE: the PLASTIC BAG - if a potential buyer did that to my horse, I would promptly escort them off my property. There are much, MUCH better ways to test a horse's nervousness. Especially a young horse. Good way to scare the pants off them though.
Most horses will react to a person violently whipping out a plastic bag and shaking it at the horse; I know mine would, and he's pretty calm!
If someone pulled out a plastic bag and started shaking it at me if I was unsuspecting, I'm sure my own poor heart would almost fail!
Regarding the horse itself - SUPER cute. I really like her build and the color is just extra. I normally don't like Appys too much, but she is stunning. I would really like to see more recent pictures.