Give her a break. For a start, she left school to pursue acting, so yes, she's not an academic.

She misspelled or typoed "adequate". Signing the letter off "be adequate" was a nod to Altman's amusing habit of saying, "That was adequate," after he was satisfied with a scene he was directing.

The "12st" book is not a hilarious misspelling of "12th". She is referring to the book of Alcoholics Anonymous's 12-step programme.

Et cetera.