Longline

As Richiev has stated, this is simply the set up. You don't need to tell us the character's world has been turned upside down - in any story that's what the inciting incident does - it's a given. What you do need to tell us though is what she intends to do about it. She can't change history so what does she decide to do in order to deal with her family's past? Think visually too - film is a visual medium after all - what does her journey look like on screen.

Hope this helps.

There needs to be more to this logline.
A story begins when the lead character's life is turned upside down.
As a result, your logline just describes the set-up, not the story.

"When she discovers her family's dark legacy of gaslighting, a confused ethics professor must..." (Then tell us what she must do)