What Happened to Willow?

Willow had a clear winter, no real coughs and colds hat i can really remember happening. But in march of this year she got her first episode of what they call viral weese. We spent three days in on the children's ward. And pretty much since then, every time she's got a coffer of cold, we've ended up in ane at lona. I think she's had four, four stays in hospital now in the last three months.