I am just a single horse owner, but I have owned a few in my life, so here goes:
I like to look for brains first, then disposition, then feet, then confirmation and finally good looks.
She looks like she would be an easy ride, a nice sloped shoulder, perhaps a little long in the toe. Her back legs look a little sickle hocked, but that could just be the way she is standing.
My advice is to try her! If you can, see if you can bring her in yourself, so you can see how she is with new people handling her.
I had a riding instructor who once said 'any horse can kill you by accident, don't get near one that wants to!'