Miss Mebbin was a very selfish, mean, and unethical lady. She was a real Mammon worshiper. It appears as if money was the sole purpose of her existence. She always adopted a protective elder-sister attitude towards money. In her presence, she would not allow any money be wasted in tips to waiters. She showed mean professional ethics, when she blackmailed Mrs Packletide. No doubt she succeeded in extorting 680 pounds, but she must have earned a bad reputation among her clients.