Sable (as well as Leif and Brewster) is my favourite NPC so despite having unlocked all of her patterns I still talk to her, it's really interesting finding out more about the elaborate and some what dark backstory nintendo has given her! I don't think any of the other NPC's have as story
I talk to her everyday! I think I've unlocked everything from her already but it's a habit to just talk to her first then shop haha I do hope that mannequins eventually get added into the game though
I've unlocked all of her patterns, and I try to talk to her most days, but it's not every single day. She's still one of my favorite NPCs and I enjoy her dialogue, I just don't always have time.