Can't confirm, as another view isn't shown (I checked) but I would say Sage is in heels at the car wash. They look like they would be heels rather than sandals to me, based on the front (but bearing in my my lack of expertise in this subject area!), but her ankles also look too high for her to be in flats. Also, given that she is just supervising, and what the other Sisters are wearing, and just Sage being Sage in general, I can't see her not being in heels there.