I've had my one paint mare since she was 2 years old. I had only had her for a few months and took her on a camping trip with 6 of my friends. They couldn't believe that my 2 year old was so well behaved and didn't spook at anything. I agree that younger horses are usually more "spooky" than older horses, but I think alot has to do with their tempermant to begin with.

How does she act in the barn and in the riding arena? Does she spook at someone leaning over the fence or waving something around? Test her with some things to see how she'll react to them.
I can tell you really want that mare! Why don't you ask if they'll take a little less money for her and see if they'll take payments?
