It's a justified worry with a b&s, particularly with Nat.
My advice with MAGFE, never EVER assume that Nat will be available on a given day - she'll likely pawn you off to another girl - she's the defacto MMS for the spa.
With that said, the roster looks like this week, so probably worth trying next week for a fuller staff. If you're gunning for Nat, this week is good as time as any from what I can tell IMO.