Rubes can't you set up a booby trap to trip her up in the office? The sight of her sliding across the floor on her face in front of everyone will give you the utmost satisfaction and the humiliation would probably make her never come back again.
Her leaving a job voluntarily will mean no unemployment benefit for about 3 months too....double whammy mate!!
Oh b ugger, that won't work, she'll only claim compensation for being injured at work and end up with loads of dosh. D'oh!
No, what you need to do is buy a nice cast iron frying pan during your lunch hour, be showing it off in the office while she is right near you and then YOU 'accidentally' trip in her direction and....PAN HER!!! Then you cry like a good drama queen should with the pain of 'breaking your wrist', take a month off work and YOU claim the compo for an accident at work. Hahahaha!
If only huh? ;-D