Elizabeth is not a Bennet by Laraba Kendig

Elizabeth’s future is uncertain.
Mr. Darcy’s admiration is not.

Before his death, Elizabeth Stowe’s father sent her to live with the Bennets. She has lived most of her life at Longbourn and is startled to learn she is heiress to an estate in Scotland. Mr. Bennet adores his adopted niece, and he could not bring himself to tell Elizabeth the details of her long distant past … but now he must.
Fitzwilliam Darcy did not expect to fall in love with a beautiful orphan, but from the moment he met her, he was entranced by Elizabeth’s fine eyes and sharp wit, which relentlessly demand his attention.
When Elizabeth is attacked by a mysterious antagonist, it is Darcy who comes to her rescue and finds a way to keep her safe from danger. Does the attack have something to do with her dead mother’s Scottish estate? With Darcy as her protector, Elizabeth leaves Longbourn and steps forward into an uncertain future.

This is a sweet and clean, low angst Pride and Prejudice variation where all of the Bennet sisters have happy endings.