So while watching, Helly suddenly appears from the elevator and I wonder. She disappears during the vending machine moment and I have to wonder where she is.

I think it’s possible, but looking at the dialogue and how she reacts, it’s definitely Helly R.

Also, https://www.latimes.com/entertainment-arts/tv/story/2025-03-21/severance-season-2-finale-explained-mark-helly-gemma

So it’s Helly R.