have had it

Reader's Digest １月号(2009年)の "@Work, All in A Day's Work" コーナーの記事からです。
After a day of accidents and mistakes, my coworker had had it.
"Why," she cried out in exasperation, "do things that happen to stupid people keep happening to me?!"
このいかにも口語的な表現 "had had it" の意味が分からないので辞書で調べます。OneLook Dictionary Searchで "had it" を検索したらTheFreeDictionaryに "have had it" の項があり、 Informalとして次の三つの意味がでていました。
1. To have endured all that one can: I've had it with their delays.
2. To be in a state beyond remedy, repair, or salvage: That coat has had it.
3. To have done everything that is possible or that will be permitted.
記事では1の意味で使われているように思えます。
またTheFreeDictionaryには "have it" の項もあり、そこには：
1. To assert; maintain: Rumor has it that he quit.
2. To express in a particular way; phrase: As her friends have it, she likes her new job.
3. To think and act with respect to (something being considered): Have it your way.
4. To gain a victory in a voice vote: The ayes have it.
とありました。こう言うありふれた単語を使った口語的な表現は、即座にどの意味で使っているのかを知るのは難しいですね。