Aw There are some awful bugs about at the moment.
Do you have a vaporiser? I have found ours to be SUPER helpful in the past for getting a good nights' sleep when particularly Phoebe got colds/coughs. We are currently living in a fairly damp house so I'm reluctant to bring it out again even though last night she coughed practically all night long.
It is so totally heart wrenching when they're that sick. Hope she bounces back really soon.