A lot of women (and men) have "best before" dates. Having children is the end of the line for the attractiveness of many, many, women - not because it has to happen, but because many women just don't care to fight back into shape.
You might just have to let Vassy go, and hope the CBC can produce someone who can replace her to your satisfaction.
Frankly, I never saw as much in her as you do, and I would have laid plenty of money on the prediction that she would let herself go after having kids. Most daily grind reporters and media hosts look for an easier gig as they get older (where they don't need to keep up appearances).