She wasn't beaten to death for being rude. She attacked a manager for telling her to leave after berating a 17 year old employee. She punched the manger in the face, yanked her to the ground by the hair and continued punching her while on the ground. The manager only got away after the chunk of hair she was being held by was ripped out of her scalp.
She died from a heart attack because she started a fight with a 20 year old girl while having congestive heart failure. The manager even brought her a cup of water to a person who just assaulted her because they were worried about them.