Mary Louise is an older woman, with light brown hair, thin-rimmed glasses, and pale skin. She often wears collared shirts and cardigans. Her hair is short and she has bangs.
Mary Louise has a very particular personality. She nitpicks, focuses little things about everyone around her, and isn't afraid to say what's on her mind. She has an intense personality and puts those around her on edge, specifically Celeste and Madeline.
Mary Louise can be very caring. She is extremely protective of her son's reputation and she sees him in a golden light. She thinks he can do no wrong. She is very loving and attentive with her grand children. It's clear that family is extremely important to Mary Louise and that she will do anything for them.
Mary Louise can be stressed and intense at times. She likes to scream to relieve the tension she feels. She can also be very rude. She said a number of rude things to offend Madeline. She also often says snide comments to Celeste.
Perry's mother, and Celeste's mother-in-law, Mary Louise has come to Monterey looking for answers about her son's death. She temporarily moves in with Celeste and the boys to help her while she deals with the death of her husband. She makes food and watches the boys while Celeste is out. Once she realizes she is in the way and overwhelming Celeste, she decides to look for an apartment in the town that she can stay at, in order to see the boys more often while giving Celeste space. Celeste still believes that it's not enough space.
- Perry Wright (son)
- Celeste Wright (daughter-in-law)
- Josh Wright and Max Wright (grandsons)
- Ziggy Chapman (grandson)
"It's meant to be shared, grief. It's insurmountable, too difficult to battle, to be waged alone."
"I do look at you as an enigma. That's how Perry first described you to me. Did you know that?”
- On January, 24, 2018, it was revealed that Meryl Streep would be joining the cast for Season 2. 
- On April 5, 2018, HBO released a sneak peek of Mary Louise in a twitter post. 
- Perry's unnamed mother is mentioned in the book.
|Season 2 Appearances|
|"What Have They Done?"||"Tell-Tale Hearts"||"The End of the World"|
|"She Knows"||"Kill Me"||"The Bad Mother"||"I Want to Know"|