Huh. Is she genuinely suicidal? Is she really dumb enough to deliver such a blatant insult to a goddamn SPYMISTRESS... a frickin magical spymistress at that. Someone that quietly disappeared people from extremely secure locations more than once for her predecessor. While admittedly the response was controlled by dice and that sometimes things just go badly (we somehow botched -spectacularly at times- every role to save abelhelm) but I can't help but hope that theirs an option to remind the newly appointed Countess that yanking the chain of a grey wizard carries consequences either politely or less so.
1) She'd consider keeping a wizard around to be suicidal,
2) she gave you a rather polite dismissal and offered a letter of recommendation, neither of which she needed to do, and
3) the pecking order is laid out unambiguously by the Articles of Imperial Magic. Elector Count trumps Wizard, period.
Keep that in mind before sparking off a campaign of terror that will end with Mathilde's execution at the hands of the Grey Order.