I don't trust my knowledge of conformation enough yet to be productive, but your mare, who is gorgeous, looks so similar to the mare I learned to ride on! I had to do a double take they are so similar!
Good luck with your girl, she seems to be an awesome horse :)
She looks to be decently put-together, and others have covered the critique pretty well. However, please make sure the girls have helmets in the future, especially as this is a new horse and you probably don't know all of her antics yet.
Overall a nice looking girl. She looks a little sickle hocked and post legged in the rear, but nothing that should hinder her from doing what you want with her. Have fun!
A horse can't be both sickle hocked & post legged. A sickle hock has too much angle & a post leg has not enough.
If this horse was set up square where her hock met the point of her buttocks she would be found to have neither.
I like her.