Poor Madeleine, it's not fun feeling so miserable.

With my DS, I've found that his colds seem to be heavy for around 5-7 days, but the nose wiping is still required for at least another week, ie colds last for 2 weeks. I haven't used one, but know people who swear by vapourisers that you can get from your chemist. And if she's really snuffed up, then raising her mattress a little bit when she sleeps can make her breathing easier (in the same way that it works for us).

And get some garlic & other natural things for yourself, cos there's a really good chance that you'll get what she has. I have had more colds in one season than I reckon I've had in the 10 years BC (before child)