clippityclop, she has just been a pleasure horse but we've gotten involved with a cowboy church and they do alot of different things sorting, roping and playdays. She has a natural cow sense to her and lots of speed. I want to learn more about confo so might as well start with my own horses:)
Is she older? Looks it from the backbone - she needs another 50-75 lbs before she gets put into too hard of a workload and maybe even more if she needed work or be ridden pretty regularly so I'd start there. And with activity and general conditioning, I see a really pretty mare!
As she stands now, she has a great long/sloping hip and even though she is not as close coupled as some breeds, I think she will do fine for what you mentioned above because she is not a heavy boned mare and has more of an athletic build. She has a decent length to her cannons (not too long or too short) so I bet she is fairly comfy to ride at a slow jog. She lacks muscle due to lack of conditioing I'm sure, but that will develop with some easy to medium difficulty rides over some hills and slopes.
Teaching her to round her back and carry a rider while driving with her rear will develop her topline and abs and will muscle up that rear (groceries will help with this - altho she isn't starving by any means, but it will help her build muscle faster).
It is hard to tell because her head is tilted and it makes her neck look thicker than it probably is but it seems she's got a good overall balance where her head ties to her neck and doesn't seem to be unbalanced anywhere. I say this mare can do just about anything you point her nose too. But I'd get her on maybe some free choice hay/grass and let her bulk up a little or she might get a bit anemic on you in the beginning with her new activities.
That's all the positives I can give you right now (I don't see any glaring negatives)- I'd love to see her in about 6 months after she's conditioned up. She is gorgeous now but I bet she'll be even more gorgeous later!
What do YOU think about her? That's all that matters anyway!