The Octopus (2000)

A woman whose husband travels to work abroad and leaves her facing loneliness and dreaming inside that she will kill him and take revenge on him for those years that he stole from her and then she thinks that the dream has become a reality and that she has already killed him and advances to the detective, admitting that she is a killer, but the doctor appointed by the court and his lawyer friend feel that the lady is innocent.

Unfortunately the movie The Octopus is not yet available on HBO Max.