Elizabeth Frankenstein is a fictional character first introduced in Mary Shelley's 1818 novel Frankenstein; or, The Modern Prometheus. In both the novel and its various film adaptations, she is the fiancée of Victor Frankenstein. From Wikipedia
The director emphasizes themes of fatherhood and empathy in a non-horror take on Mary Shelley’s classic, with Jacob Elordi, Oscar Isaac, and Mia Goth leading the cast.