She was in the ruins and killed Toriel to gain her exp, she walks out of Snowdin and is on her way to kill other monsters to kill the human once and for all, you followed her to stop her but you lost her, you walked into Snowden and prey that you don’t get caught by her and killed. While Dust Sans walks out of the forest after killing Papyrus, she wraps his scarf and her and walks into Snowdin

Sans: “Sorry bro it has to be done. Now for more LV"