Mildred Montag is the wife of Guy Montag. Mildred has many mental problems that she can't face because she does not believe they actually exist. At the beginning of the book she overdoses on pills in an attempt to suicide, but she does not succeed.
She sits at home all day watching TV in their parlor which brainwashes her to point that she even considers the characters of the soap opera her family. She represents the majority of society that has succumbed to the government's propaganda and laws.
One by one Mildred burns the books that Guy tried to hide. Eventually she calls in that books are hidden in the house. When the fire department comes, including Guy, she leaves the house immediately. Overall Mildred is not altogether happy.