I don't know about $600. In all honesty, you could do better for that much. I also sincerely doubt that she paid over a thousand unless she bought it a long time ago. It looks like something people might have shown in maybe 10 years ago or more. I once owned something that looked similar, and it was a show saddle from the 1980's.
What would you be planning do do with it - trails, shows, training, lessons, gymkhana?
In my opinion it wouldn't be bad for trails and lessons but I'd worry about the skirt lengths if you intended it for showing and training for show.
I will always advocate the Royal King roughout training saddles. They're well made and they feel great, also they fit most any stock type horse very well. I think the best price I've ever seen them for is on ebay actually, and it's where I got mine. This is just an example of one, they're about $500 each. ROYAL KING ROUGHOUT TRAINING SADDLE 15.5" SUEDE SEAT
Of course, you can find all kinds of saddles, new and used on there as well. The Royal King is suitable to use training for show, on trails, and for any western riding you would want to do outside the show pen, but there are saddles made specifically for trail riding that would be more comfortable on long rides. Also if you were into speed events like barrels, synthetic saddles are often the best because they're so flexible and light - they are also built differently from other western saddles. I'd recommend looking around for a while before you make your decision. Some people will always try to take advantage of saddle buyers so oddly enough you will usually find the most honest deals online.
You can also try searching on Chicks Saddlery
. They have some good stuff too.