Time Reverse

Lilac fits in well with her parents and brothers, but she always felt like there was something missing from her. When she and her brother, Lorcan, sneak off to find hidden passages one night during her third year; they find a portkey-like object. But when Lilac tries to investigate it further she's caught in a shield and is taken away to the past. Now, she has to try her best to not reveal her identity to her great grandparents as they help her get back to her timeline. Will she succeed or will she blow it and get stuck in the past forever?