Hkj
I don’t think that’s enough of a punishment. That only punishes Mito. What about Konoha? Taking their barrier seals? What would stop them from replicating it? Who knows where they have it written down? You’d have to burn down the village and kill all upper level ninja, Jiraiya, Orochimaru, Hiruzen, Danzo, the barrier team, sealing team, etc. to ensure they can’t just rebuild the barrier. The best punishment is seizing the 9 Tailed Beast as payment. Setup monitoring seals for when she’s ready to transfer the beast (and ready to die). Come back and take the tailed beast. Alternatively, I think it’s fair to steal all their jutsu. Create shadow clones and seize the scroll of seals, clan jutsu from the Senju clan and Uchiha clan compounds, hidden jutsu from Yamanaka, etc.