Mitch was brought up in a tough neighborhood (similar to Holder). She met Stanley at some point during her adult years, fell in love with him, and eventually the two married. Because his job was high paying, she was able to enjoy being a housewife. They had three children together: Rosie, Denny, and Tom. She adapted a very strict manner of parenting and attempted to shape them into adults faster than most other children their age. At the same time though, she cared deeply for them and only did what she thought was for their benefit (so as to make up for her own troublesome childhood).
Rosie's death stuns Mitch into a grief so deep that one night she tries to recreate the experience of drowning, submerging herself in bath water for a long moment before bursting to the surface, gasping for air. Mitch spends hours in Rosie's room, staring at its contents.
At one point convinced that Rosie's teacher, Bennet Ahmed, killed her daughter, Mitch influences Stan to administer justice himself. Stan drives Bennet to a secluded location and beats him so severely that he nearly dies.
With Mitch overwhelmed by sadness, Terry takes charge of Denny and Tom. The one day that Mitch offers to help with the kids, Mitch becomes distracted and leaves them in the family's SUV in the garage with the motor running.
While Stan is in jail for the assault, Mitch learns that he has reconnected with Janek Kovarsky, a Polish mobster for whom Stan once provided muscle. Stan admits to Mitch that he went to Janek for a loan, but she cuts him off before he can reveal that the money was to help cover the mortgage on a house he'd recently bought to surprise her. Enraged, Mitch refuses to post Stan's bail.
When he returns home after Terry posts his bail instead, Mitch tells him that the boys don't need her anymore. Stan replies that both he and the boys need her, but Mitch just sobs, "Everything about this place hurts me." That evening, she leaves her family.