Well, she's cute! I think the barn I work at would like to work with her (they're saddleseat though!). If you liked her dam a lot and you like her, then I would say why not? If you're not in it to get to the top anyway, it doesn't hurt to try and see where you go with her.
I do low level dressage with my arabian and I don't know how he's "built" for it, I'm not good with confo stuff, but he tries his best and we've accomplished a lot :) I think some horses can surprise you. I know that conformation has a lot to do with what a horse can do whether it's saddleseat, dressage, jumping, etc, but I also think that sometimes horses you wouldn't think would make it in a certain discipline do, because they have a lot of heart and try.
(Just so nobody gets upset at this.. cause I see a lot of this on threads lol- I'm NOT saying that heart makes up for poor confo, just saying that a horse with heart can often go further than you would anticipate! also not saying you should push a horse past what they're capable of so you don't put extra stress on their bodies)
just my two cents!