One thing I find interesting is that her name is a homophone for "Pilot", which we can interpret as symbolizing her 'leading those who are in need of guidance'. Despite being named after the man who plotted the crucifixion of Jesus, Pilate proves to be anything but wicked. She is incapable of cruelty, and is willing to do anything for others to relieve them of their suffering.
When Milkman and Guitar get in trouble by the police, she feigns bewilderment to get them out of their situation. When her daughter Reba is beat up by her boyfriend, Pilate steps in and threatens the man at knife point to never go near her daughter again. She shows that despite her old age, she has never lost her strength and fortitude. Pilate is a woman who loves others and is willing to do anything to protect her family.