Re #4 - I'd would not be surprised to hear accusations of sexism against a person who referred to someone as a harridan in a workplace situation. If the designee were male (edit: or the speaker female), the speaker might get away with it, but... yikes.
Re #3 - I've never heard it said, but it made me smile, I like it.
Certainly you could say "her secretary dragooned her into [e.g.] squeezing in one last appointment." (in AE, at least)
Typing pool jokes are also to be avoided, I suspect, so I wouldn't use the original version which is "the terror of the typing pool" (according to Ggl' it is from the publicity for a 1959 Joan Crawford film), but perhaps you could modernize it too "the terror of the water-cooler crew"? Both play on the fixed expression "terror of the high seas", used to describe pirates. There is a cliche that American employees to gather to chat around the water cooler. Just to be clear though, I made the phrase up, it is not a fixed expression, but I think people would understand it.