I'm not sure this is the right place as I think it WBU to allow it to continue and I've decided that from 2014 onwards I won't tolerate this sort of behaviour.
She's a classic passive aggressive type, sly, catty, underhand, spiteful, malicious remarks but delivered in such a way that it's tricky to call her on them. I want to do just that though.
I don't want to go down the 'did you mean to be so rude' track as to me that too is passive aggressive, and I want keep my cool and calmly beard her, as it were, in response to the next dig.
That she is a colleague isn't that of the essence, PA is PA who ever is dealing it out, but I do obviously have to keep working with her and I don't want to escalate this. I simply need to find a way unequivocally let her know she's been called and that I won't accept her doing this. I would love some advice or ideas on how to do so.