Your mare is adorable I must say. But if you want my honest answer, she has a few conformation faults...
The thing that sticks out to me most is her high set/prominent withers, neither the Appaloosa or the Saddlebred have withers like her's, but that's not a huge fault.
Her pasterns are VERY upright and that could be the source of a lot of pain, and to add to the problem, her hooves are scarily upright and small.
She's a bit back at the knees but she's got that stocky Appy look that we all love so she passes on that one... :)
Because of the fact that she was a broodmare and she is an Appy cross, she's got those well sprung ribs, which isn't bad but it offsets her a bit.
Ok, I love that butt. She's got so much power there, it's making me jealous...
Altogether, your mare is adorable and beautiful, she just has a few things that aren't perfect. But she wouldn't be perfect without her imperfections!