A Mother's Madness

Frisk was gone for two years, and two days alone was enough to drive her insane. Wondering, "where, oh where did they go?" she ached to know. But there was no body found and they were last seen at Ebbot, where children climb and never return. Frisk was announced dead but that answer didn't satisfy her. Oh, but what happens when she finds out HOW they disappeared and the mythical beasts of Ebbot return, and a kid with her child's very same face, hair and preferences is with them?
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Good morning, evening and afternoon, my lovelies! This will be a (Y/N)xVarious and I'm open to suggestions, but I won't be straying from the story I'm writing. Other AUs will also be involved. Please enjoy<333.