I would not breed just based on her breed. 60% of horses sent to slaughter are western pleasure type horses like QH's. TB's only made up 11%.
Quite frankly, QH's are a dime a dozen around here. I could go to any auction and have my pick of perfectly good QH's that are practically being given away. The AQHA needs to re-think their breeding programs.
Why breed? You could go out and buy an already pregnant mare if you wanted a foal. There is no profit margin for breeding QH's right now, or most horses at all. You could also go out and buy a nice 2 yr old and send him for training for the cost of your breeding fees and mare care.
I can't tell if it is the picture but her front ankles don't look right. They look dropped and are not as upright as her hinds. Her body is very long. Ideally you want to cut the horse into 3rds and each portion should be equal in length. She also has tiny legs and a very upright shoulder angle.
For example a horse with good conformation: http://i278.photobucket.com/albums/k...ck161/nice.jpg
Not that she isn't a nice mare, but there are simply too many other horses out there that need homes. Some of the rescues near here have some really nice horses with basic training that have good conformation and absolutely nothing wrong with them. We have a problem as society when perfectly good horses are being dumped.