Can't hurt to ring back and ask. One reason they might not have swabbed your DD is by the time the cough presents you don't always get a 'positive' result even though you are positive.

I'm interested to hear what they say, if you don't mind reporting back. It's a personal interest of mine now as to how other doctors treat for WC.

Oops MadB I didn't read the last line of your post and I've just posted, virtually the same thing.