She is cow hocked and a bit sickle hocked. She has 0 withers and looks like she is well fed Her shoulder is straight but she is also well coupled. She has a darling face and I do like her coloring. She may be built slightly up-hill but I could be wrong as I'm eyeballing it.
I think your mare is adorable. I think her coloring is very cute, and her conformation is pretty good. Her shoulder is maybe a tiny bit steep, but not bad. Nice low withers (perfect for bareback riding), pasterns are short and nicely sloped. Her back may be just a little long and looks like the TINIEST bit roached. Croup is a good length and rounded. She looks cowhocked behind.
Overall, a nicely put together little mare, very proportionate and sturdy looking.