The problem is that you didn't say "I received a letter in the post from the OCP ... So I didn't have to worry, the renewal process was very simple in my case", but you said "You will receive... so do not worry, the renewal process is very simple".
Two "standard renewals" may require different actions. Your husband may have an unrestricted work permit, so an extension is easy as long as he continues working. Another spouse's partner may be seconded to Switzerland and the original assignment duration may end and the host company may first need to apply for an extension of the work permit - and there is no guarantee for approval - before the couple's B permits can be extended.
And Liubovs specific situation is absolutely different from yours as her husband's permit will not be extended. And if a B permit for employment will not be extended, the B permit for family reunion will also not be extended. So this will not be a simple extension. What it will be exactly (if a extension of stay will at all be possible), will depend on many factors. "Advice" like "no need to worry, lean back, wait and see" may make the difference between finding a possibility to stay and having to leave Switzerland for good.