The Perfume of the Lady in Black
Il profumo della signora in nero (original)
Sylvia, a chemist who begins to suffer from strange visions. She sees a mysterious woman in black applying perfume in a mirror, strangers following her everywhere she goes, and a ghostly little girl reminiscent of Alice in Wonderland, who may be Sylvia herself as a child. It turns out that Sylvia stabbed her mother's sexually abusive boyfriend to death long ago.
Starring Mimsy Farmer, Maurizio Bonuglia, Mario Scaccia, Jho Jhenkins, Niké Arrighi, Lara Wendel, Aleka Paizi, Renata Zamengo, Ugo Carboni, Roberta Cadringher
Watch "The Perfume of the Lady in Black" from streaming services Amazon, Kanopy released in 1974. It's a mystery and horror movie, and has a rating of 6.6 out of 10 from Imdb which is usually fine for this kind of movie.