The case book play cited is correct. However, in this case, the home scorer clearly intended to deceive the officials and the visiting scorer. She recognized the error and took it upon herself to make the change, when what she is
required to do is to notify you. (2-11-2) I would have called a T as well.
BTW, don't put up with that "Home ex-AD comes and argues with us the entire half-time" crap!