Her Song of Fire and Ice

They say when Sansa Stark was born, she'd been touched by fire. Maybe she was, maybe she wasn't, but fire and ice seem to be in her blood. Maybe that's why her soul is damaged so much that she needed three Soulmates to hold her together? Depending on who's asked, Soulmates weren't the happily ever after of the stories Sansa hoped for, not with the men she's apparently bound to. AU.