I think that she only does fashion checks for the person who is the mayor of the town. I may be wrong but I think thats how it works... Thanks so much for offer to help others though!
Edit: I just figured it out she tells you to go away lol
Oh wow, I didn't realise that. I thought the Nookling upgrade happened for the mayor but other characters could still do the check & get furniture. Thanks for the correction, it didn't say on the webpage I looked at.
The offer of help with fashion checks still stands, though. I have a tendency to be a hoarder & collect lots of clothes.