A Timeshift Tale

What if the monster war was won by the monsters, but the king paid the price? What if Asriel survived the assault from the humans? What if Chara faked his death? And what If a certain royal scientist had been saved from the core by Sans who paid the price with his magic? What if Frisk had an older sister?
Jill, a twenty-two year old student at Pennsylvania State University, has a troubled past that binds her fate to meeting an old friend and someone she thought she'd never see again. These encounters lead her to meeting the queen and prince of monsters, three skeletons, and a cute monster couple who obsess over anime. Might be slight AU? Not sure yet. Decided to change title from Othertale to a timeshift tale because plot reasons that'll be revealed later in the story.