What did nurse ratched finally do in order to begin to topple the reign of McMurphey?

The Big Nurse begins to post financial statements of the patients. These statements show that McMurphy has more money than he'd had; this isn't the same in any other case. She also takes full advantage of the fact he misses a meeting to take a phone call...... insinuating that he doesn't care about his friends. It is also pointed out that McMurphy makes fixed bets in order to make money off of the other patients.