A probationary period is common in Canada too, but it is always mentioned up-front and I have never heard of a company trying out several potential employees in

A probationary period is common in Canada too, but it is always mentioned up-front and I have never heard of a company trying out several potential employees in a series of probationary periods. Maybe they weren't happy with her at the end of her probationary period, but are too weak to outright fire her?