Well dang, hopefully this is about as far down as she gets kicked for now, then.
But also, I feel like it's kind of shitty how the first actual conversation the manager has is the one where he's preparing to let her go (even if it turns out he had "good intentions" like firing her but getting Momoka to direct her to somewhere she can train a bit more). She's someone he personally scouted for the store, so I feel like if he actually thought she was up to snuff for it in the first place, he should at least put in a little effort + have a discussion with her about her performance issues+improvement before pulling this.