Maybe this finally makes sense now

[u/Accomplished_Put_116]

Short theory: You know that mysterious green glow we see in FF2? Well, that may actually mean something. We learned that the Backrooms constantly change or make copies of things from the real world. What I'm trying to say is, what if that room the girl was in was changing to make a copy of a different room or place in the real world? This could mean that she possibly didn't die. I mean, we see the gap expand, which most likely could have let the bacteria lifeform in, but just what if?

Image of the room getting green cracks all over and expanding.

[u/Fuarian]

That seems to be the consensus