I also find it hilarious that, despite no longer being an advisor and taking part in the every-turn council meetings, Mathilde's been consistently advising and influencing and generally helping so many rulers for things that aren't directly her job. There's everything to do with aiding Heidi about Mandred being a wizard, of course, but also giving Roswita some advice about how she could make a bid for Empress, helping Konstantin with Nuln's foundries, the whole thing where we killed Boris' dad so he could actually start reforming Kislev, etc.
Last but not least is all the other times we've been helping out Belegar - helping untangle the feud with Thorgrim, helping establish closer relations with Karak Vlag, and making his library grow more than he would have thought reasonable.