They can, but Mei can't openly sign a document saying she gave permission to perform an assault on Foreign soil, especially not given the rather tense state of foreign relations. She's more concerned about quelling Kiri's internal problems than expanding ambitiously. Her ideology, as far as diplomacy comes, is to do what benefits Kirigakure, but even then she's a leader that focuses internally before setting her gaze outwards.Like taking out the village? I thought you said the genjustu specialists could do that subtly and effectively?
On the other hand, the clan leader of the Hozuki clan might just be interested in such a proposal.