PLEASE HELP FIND A FANFIC

Hi All! I’m trying to find a specific fanfic. It was a Female Harry Potter / Robb Stark fic. Female Harry (I believe her name was Rose) was creating a potion when it exploded and she was transported to Westeros into Robb Starks camp. Later on, Neville, Luna and Kreacher join her. Hedwig is an ice dragon she later reunites with, and Robb and Rose become the leaders of Westeros!

It used to be on AO3 but I can’t find it and I’m unsure if I’m looking for it wrong and stupidly didn’t save it, or if it’s gone! I’m 90% certain the word Witch was somewhere in the title!

Thank you!!