is she responsive now? it sounds like she's heading for a diabetic coma. becoming belligerant is common in brittle diabetics with low blood sugar. i worked with a lady who always got argumentative when her blood sugar got really low. you had to take the bull by the horns and make her eat some sugar-hard candy, honey, O.J. etc. my co-worker also became listless, slow response time to questions, and inappropriate responses.
waiting for her to take herself to the doc or E.R. may be too late.
is this her normal demeanor? does she live close by? does she answer the phone?
i find it hard to believe that she didn't get any instructions on diabetes, diet, exercise, etc.