Allie & Me (1997)

Michelle comes home early one day to find her husband in bed with her best friend. On the run from the disaster her life has become, she meets Allie, a developmentally disabled woman she comes to consider her best friend. To avenge all wrongs done to them, Michelle and Allie start a new life that includes burglary, and that burglary goes wrong when they break into the house of one woman and find her obnoxious son Rodney there.