Women's winter boots are a rough one. They're often built to be stylish, and so neither warm nor durable. Your ask is further complicated by the fact that leather isn't a great winter option, since salt destroys it.
Baffin is a great brand, and make solid and warm boots. Manitoba is a popular option for people who live in genuinely cold places.
UGG Adirondak boots are leather and warm. Only time will tell if they're built for life.
Pajar make great winter boots, if you can find some Made in Canada. The Made in China stuff is cheap and crap