First of all, unless she were to go through a Hanoverian, Oldenburg or Dutch mare inspection and pass with a certain score her foals could only be registered as American Warmbloods. With only a 7.2 in AW, I can't imagine anything higher than a 6 or 6.5 from any of these registries (meaning that she has a good chance of not making it into a book), plus there will probably also be a lot of paperwork required. I would talk to your area rep. About the specifics, because I am not very versed in inspection policies..
Depending on what you are buying her for, she might be a good buy. As a dressage horse, she would probably make an excellent lower level mount, but it is doubtful that she would be able to handle the collection and have the movement and ability for the higher levels. For jumping, she could knock over a 2' crossrail or be able to do the 4' averagely. You don't know at this age. The best thing to do is look at her lines.
Basically, buying a foal is like buying a lottery ticket. You don't know if you're going to win or lose. It is really important to look at lineage when buying a horse and be prepared to pay well for good, successful lines. Because she is part quarter horse, I imagine her price would be quite low (comparitively to foals born as Hano/Olden/KWPN), but this also means that you are taking more of a gamble, and a higher chance of ending up with a registered pleasure mount.
So it's your choice. Personally as someone who seriously trains dressage and competes a few times a year, I would pass. But depending on your expectations of what the foal will become, and your price range she could be just right.