Shelly's Hate and Violence

Lara suspects that Shelly's pocketing the money for the fake medical bills and using it to buy things for herself. When she finally asks Shelly for evidence to prove that she has cancer, it's actually Kathy who tells her to back off and defends her friend. The children are forced to witness these horrifying acts of abuse and they know that Kathy is basically taking Shelly's hate and violence and it's sparing them.