Emerald Sparrow didn't make a decision on her own.
It wasn't because she couldn't take charge of this matter, but because she felt that this kind of thing should be discussed together with "allies" from the Magical Affairs Institute and the Research Institute, to avoid any misunderstandings that might arise in their cooperative relationships.
The information Mint provided was undoubtedly valuable, and their request for the Research Institute not to immediately cast the net was entirely reasonable.
In fact, even if she hadn't made this request, the people from the Research Institute and the Magical Affairs Institute had no intention of acting immediately.
After all, if they were to uproot the Black Ash Dawn's undercover agents directly now, who would cause trouble next? Rely solely on those Claw Marks whose whereabouts are still unknown? If no one causes trouble, where does the Research Institute's credit lie? How can the Magical Affairs Institute reclaim their Gemstone Scepter?