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It is slowly revealed that Julie is a filmmaker working on a project about her mother and the grand inn they are staying in was once belonged to Rosalind's family. She has a lot of memories spending time in the place. Julie timed the visit as Rosalind's birthday and early Christmas celebration and mom seems pleased and sad at the same time. Julie wants very much to connect with her mom and please her but doesn't really seem to know how, other than superficial level. She is also at a loss on how to proceed with her project. And there is some supernatural occurrence in the manor that interferes with her work as well. Julie hears noises at night and can't sleep. When complained to the receptionist, she was told that the room above her has been vacant. Julie sees a ghostly figure at the windows while walking the dog outside. It also seems unusual that there are no other guests in sight other than her and mom. They dine alone and joke about sampling every meal on the menu in their stay.
Using the gothic horror trope, Joanna Hogg creates yet another meta-auto fiction about her own complicated relationship with her mother. Hogg's yearning for connecting with her mother through making a film about their relationship and feeling guilty about it at the same time, using the same actress playing those roles is in tune with real life mother-daughter team (Swinton and Rose Swinton Byrne) in Souvenir playing mother-daughter. Eternal Daughter takes the step further, yet getting no clear answers on finding out more about her own mother or closure of some kind she longed for. And that frustration is all illustrated in the film. After all, many of Victorian ghost stories are manifestation of repressed emotions and feelings. Swinton is glorious in a dual role in her white wig, pretty much carrying a conversation with herself. It is a subtly devastating performance - in many of the film's close-ups both as a mother and daughter, she conveys that nervousness of not trying to hurt one another, or in this case, herself, in that educated, polite British way. Hogg aces again.