I wonder what the event that caused Dan-I to start putting up distance between herself and the others again was. We see a building under construction, I wonder if that's the school Dan-I was originally supposed to go to? And it being built is some kind of merging or takeover of her original world and the web novel? It makes sense since she was worried about Ban Yeoryeong disappearing.
The clothing she's wearing in that panel is also suspicious, it's not her web novel uniform and it doesn't look like her casual clothes. Maybe she dipped back into the 'real world' somehow and that's why she wants to distance herself, since she's not sure if it could happen again, but permanently.