Rebecca Jessel also known as Miss Rebecca was an innocent past caretaker before Dani, She's also the lover of Peter Quint which led to an abusive relationship of theirs.
The Days in Bly
Miss Rebecca was so intrigued and excited to be a caretaker/governess of the Bly. She's good at babysitting Flora and Miles and she's very humble and kind until Peter attracted her attention and became lovers with her.
Her Death
Rebecca died and drowned in the lake of Blyand she's found dead by the house chiefs. Her death was really tragic.