Theory #2: S.W.O.R.D. is in charge.
S.W.O.R.D. is a division of S.H.I.E.L.D. that has, in the comics, been about space: Sentient World Observation and Response Division. Here, the W seems to stand for “Weapon,” which adds a whole new meaning and could be referring to Wanda as a “sentient weapon.”
There’s a S.W.O.R.D. symbol on one of the screens in the control room and Monica/Geraldine could have been sent in to monitor and help keep tabs on Wanda. Maybe Wanda became so dangerous in her grief (she is, by far, one of the most powerful Avengers) that it was necessary to find a way to keep her occupied.
This doesn’t quite feel like the right theory for a couple of reasons. 1) The voice asking “Wanda, who is doing this to you?” sounds like Randall Park, who is playing former FBI agent Jimmy Woo, and we don’t know why he’d be asking that if S.W.O.R.D. is in charge. 2) If S.W.O.R.D. sent Monica in, why are they pointing guns at her when she gets ejected from the bubble? Plus, there’s the beekeeper in the sewer, who we’ll get to in a minute.
To be honest, we don’t love either of these first two theories. It would be disappointing to find out this whole thing is about an incredibly powerful woman who can’t control her emotions so she locks herself away or gets locked away as a weapon. That story is part of it, for sure, but we’re hoping there’s a little more to it than that.