Who is Marie Morgan from To Have and Have Not and what is their importance?

Marie is Harry Morgan's lusty, post-menopausal 45-year-old wife. She worries about her age, and although she considers herself lucky to have such a husband..... she is sorry they've only had daughters. The night before Harry leaves with Albert, she forces herself to stay awake, so she can wake him on time, two hours before dawn.

Marie is described as a large woman with long legs, large hands, big hips, and still attractive. She is sexually aroused by thoughts of her husband. The writer, Richard Gordon, described Marie as frumpy. She is devastated by her husband's death.