Final answer:
In Chapter 17 of 'Wuthering Heights', Isabella is injured during a scuffle with Heathcliff after she strikes him and he retaliates with a forceful blow.
Step-by-step explanation:
In Chapter 17 of Wuthering Heights, Isabella explains that she was injured by Heathcliff when she states that as she struck him with her hand, which had a ring on it, Heathcliff retaliated. As a result of his retaliatory and brutal blow, she fell and realized she had cut him with the ring.
Her account indicates she was injured as a consequence of the volatile altercation between herself and Heathcliff, though the exact nature of her injury in this exchange is more described as part of a scuffle rather than a singular act of serious physical harm such as being hit with a poker or burned with a hot iron.