Lily remained in Snowdin for a time with Papyrus and Sans, eventually coming to know the two of the skeletons as personal family to her own. During her stay, she begins to learn of the monsters' plight and their imprisonment in the underground, including the barrier that keeps them from returning to the surface. Sans eventually warns Lily (being the second and only monster to know of her identity at this point) about ASGORE'S intentions, stating that he had already claimed the lives of three humans before her. The child keeps this in mind as she continues to look for ways to move on from Snowdin. She attaches herself to the two brothers and assists around the house. It is discovered by Papyrus that it is a passion of hers to cook, but because of the "secret important training" that Papyrus has been indulging with Undyne, he sticks to making spaghetti.
Her days in Snowdin became numbered not long after she formed a bond with many of the monsters around the area. She came across a flower that introduced itself as "Flowey", stuck in the middle of the snow. The flower talks to the child and undermines her affection for the skeletal brothers and the rest of the monsters, telling her that they were only seeking to befriend her to get her to lower her guard and lessen her DETERMINATION to make her vulnerable. The innocent child didn't quite understand or fully submit to the flower, but decided it was best if she moved on before trouble could arise. Flowey played with her sympathy and love for plants and told her that he was becoming sick from remaining in the cold (hiding the fact it could travel anywhere in the underground if it chose to). She told Flowey she would come for it that night and take it somewhere warmer.
As day slowly turned to night, Flowey hatched its plan and waited patiently, knowing that before day came again it would be one SOUL closer to achieving its goal.