Hi again! For what it's worth, I was on the Chanel website last night surfing for new pieces and saw the boots with a mod shot! You can see on the model they have slouch at the ankle too. It doesn't mean it's too big for her, it's more the design. They are really pretty. As I mentioned earlier, I have the similar style from last fall, and last season, they were my go to boots.
I've gone through a lot of Chanel boots, and this style is my favorite. This style is everything I want in a boot... tall knee length right below the knee which is perfect as some "tall" boots fall too low below the knee or too tall and it covers half the knee, cool casual chic vibe, super comfy because it's the perfect width and not too narrow, classic riding boot look but with that super cool Chanel "capped toe & logo" look, rounded toe that is timeless (not pointy toe which can get dated on a boot)... it's the perfect boot in my mind! Can you tell how much I love this style?

For this season, Chanel added a little CC on the back heel which is nice touch (subtle bling).
Here is the photo and mod shot on the website (scroll down a bit to where you see "Parisian Style Reinvented." Hope this was helpful and good luck in your decision!
Shoes - Fashion | CHANEL