Praise her work (within reason, be a little generous, forget any crap things she's done), say you're sure she'll be missed by her colleagues and friends here, have a wee joke at her expense (summat silly she may have done), wish her well for Canada, but make jokes about not being able to spell Saskatchewan, and then tell her to watch out for the Mounties. Start a round of applause, as this then takes focus off you. Encourage her to say a word or two. Clap again. Present giving. Take her to pub, get drunk, slobber over her and try to give her a snog. Possibly leave out the last few steps.