Only one I can recall or most folks that I know of.
And I checked, it's interesting, wiki describes a few as making some mark on the charts indeed, but, only that one went platinum, and the next best only made silver, rest nowhere. It may be a peculiarity of the way the charts worked that some songs made it higher on less sales that week or something.
I'm not into arguing, its a waste of time, so you call it as you see it and I'll do the same. Will it enter any book as a one hit wonder? Probably not, but she isn't ever going to be a multi hit artist in the UK to me, or plenty of others.