Has she already been paid for the missed time? If so, chalk this one up to experience and cut her no slack in the future. Oh, and document, document, document. Keep track of what you do and say because she's going to push the limits.
I'm good at this!<br><br>
Make sure you have a plan (usually company procedures) and just follow it. Something like start with a talk (note the date and the conversation somewhere), follow my an email, with HR cc'ed. If that doesn't work, just work with HR on the next step.<br><br>
You must follow procedure, I think, to make sure not to play favourite.<br><br>
Formality has its place in work relationship, and it's an important place.
In my experience anyone who runs out of sick time (unless they are a relatively new employee or havent earned much yet or had a long illness of some sort) and dicking with you and using their actual sick time as vacation anyway. Maybe coming to work sick might teach her not to abuse her actual sick time.