Blast in the past

After going through the hell of the wizarding war this Ravenclaw girl was working her ass off running her family company, but something weighted heavy on her mind for years, something she needed to fix someone she needed to save. so against everyones warning she does something unthinkable she turns back time going into the past after she finally found a way to solve all her problems without completely screwing up her past or so she thinks....

(I don't own any rights to the Harry Potter series, this is just my own spin on it with some added OC that I came up with as I let my mind wander)