She might not have sought it out, but she took the opportunity when it came. She didn't go 'I'm in over my head', or call back home asking for help, she just rolled up her sleeves and got stuck in with a smile on her face. The fact that the opportunity only came about by accident does nothing to diminish the scope of the ambition needed to look at it and go 'you know what? I can do something with this'.
I mean, that's how a big chunk of Mathilde's ridiculous feats came about- she was in the right place at the right time, saw an opportunity, and took it.
If your ambitions and goals are something that would be helped by that, then sure. But if they aren't then it's nothing more than a fancy title and a cheaper tithe. She's assisting with keeping an entire Karak fed and is rebuilding a huge amount of wasteland into arable land, both of which are massive tasks by any standards, but not ones that extra influence are really relevant to.