Did someone call? Well, it's really an abuse of actuarial maths to make predictions for an individual's mortality, when in practice we deal with statistical predictions for a large group of lives. But what the heck, Peggy is fictional, so let's get stuck in! 
Based on the latest English Life Tables, if you took ten thousand women of her age, they'd be dying off at the rate of near enough 4 a day. So her chances of making it to the end of the week are pretty good.
In fact, she's currently in reasonably good health, she's got a good social network, not in poverty. Does she have any chronic illnesses or anything else in her history, such as smoking? It wouldn't surprise me if her mortality was more like that of an average 85 year old or even better. That suggests a daily rate more like 2 per ten thousand.
Overall, she must have around a 90% of making it to her 91st birthday. But of course, soap characters are subject to the capricious forces of drama not the statistically coherent forces of nature.
Now I must prepare for dinner with a thousand other actuaries at our conference. if you're in Birmingham and here a raucous celebration tonight, it's er probably not us. We'll be quietly discussing spreadshits.