Lonely.

“….i have nowhere else to go. I just wanted to take care of the children who fall down, yet…I have to deal with this…?”

Toriel felt saddened about herself, remaining in an Anti-Void, her thoughts full of guilt and shame that caused her to become an Error.

“…Why?”

Toriel looked at herself, trying her best not to look sick over herself. Why couldn’t she feel better? At the very least, you’ve appeared and entered the Anti-Void alone.

“…Someone came…! Excuse me, are you here for me, or…?”