I am not convinced her croup is really that steep. She is too fleshy to tell. I'd have to physically palpate point of hip and point of buttocks to get an accurate assessment. She may just have a low tail set that gives the illusion of a steep croup along with that "line" that appears in the photo across her hip.
She looks very "drafty" in these pics and a steeper croup is not unusual in draft breeds as it gives them leverage to pull equipment. However, while a Candadian Horse should be stout and compact, this mare in particular looks overweight for her breed standards. She is beautiful, too, just needs to lose a few pounds.