Wow she looks very healthy! And shiny!
Things I like about her conformation:
She is built nice and level. (Not uphill or doenhill in build)
She's got a nice topline like said above (ever consider western pleasure showing?)
Very well balanced, I'd say. Her chest is broad, but her hindquarters are too, so she looks nice :)
She's got nice legs. I don't see her as back at the knee like someone said above.
Things I Don't like;
Neck ties in low to the shoulder
Upright shoulders, which could lead to choppy gaits.
Long pasterns (but not long enough that I see you having problems)
I'm going to be honest, she's fat! I'm sure if she lost a few pounds shed be even more attractive than she already is!
Overall, I like her and she should be a sturdy horse to ride :)