Thing is, every place I have worked, there has been a cheeky fucker like this, who does what they want, who the manager is scared of, and who has often been there since God was a boy, so everyone is scared to call them out.
They never want to go higher than a low to medium admin position, as they don't want any responsibilities, but they DO want things THEIR way, and God forbid ANYONE challenges them.
They are often buddies with people very high up in the company (as they have been there since the dawn of time,) they often look busy whilst actually doing nothing, and some of them have a lot of time off, and they ALWAYS have an ailment. A new one every month. And when they run out, they go back to the first one they had, X amount of months back.
As a few posters have said, you should allow all the other staff to rock up at half nine, seeing as how SHE is not lifting a finger til then.
I have encountered many an employee like this in my 30 years of work life, and they are piss-takes, and cheeky fuckers, and they ALL need calling out on it, yet many 'Managers' are too chicken shit scared to do it. And I am sorry to say this, but it's often because Managers are quite young.
I have experienced many a Manager who is under 30, who is scared stiff of staff members who are older than them, and have been there many years before them, even when that person is below them in rank. Some people should not be managers, and the OP sounds like one of them.
I can't believe some people are trying to make out this CF woman's behaviour is acceptable. I can only surmise that you are all the same as her.
@WishingILivedOnAnIsland
And as 'shatners-wig' and several others have said, you ARE a poor manager if you are allowing this to happen.
@Orangeballon
You need to be more assertive op, this employee has taken over your role as manager and does not recognise your senior position. She sees herself as top dog.
This ^ in spades.