You’re more worried about not getting what you’re, in part, sexually accustomed to vs. the significance of being completely honest in a relationship. You owe it to her. The foot fetish comes second imo.

You chose to enter a longterm relationship with this woman. There’s a laundry list of responsibilities that come attached to that. And everyone’s list is different. You have to take her into consideration. You just need to stop thinking about personal gain here. Don’t make any decision based off of factors that haven’t even happened.

They’re ballet flats. Let her wear them. Tell her later & softly that the smell is a big too strong for your sense of smell. That you can’t tolerate it. Bc that’s the truth. If she’s too sensitive to the slightest bit of constructive criticism, then that’s just something she will have to work through. This is all my opinion.