User blog comment:Omega natsu2/Chapter 367: Jellal vs. Oración Seis, Predictions./@comment-4890977-20140116202552/@comment-7418318-20140116205939

I don't think Minerva would ever ally with Fairy Tail mages (even if they were willing, which they are clearly not). She might try to take advantage of them by popping into their battles with the Demons, but no actual alliance.

But juding from her violent reaction in the tank when she hear Fairy Tail mentioned, I think this transformation also reduced her self-controll, making any planning and smart thinking less likely.

And also I don't think she's all that smart. Waiting for your enemies to be at their most vulnerable moment doesn't take a genius.

For example if it hadn't been for Wendy and Chelia's skill at healing magic (which Minerva had no way of accurately juding in advance) Lucy would have died. So going that far in hurting Lucy was not a smart thing to do and she was just lucky that Lucy survived. Because if she really had killed Lucy, there's no way she'd have gotten out of it.

Also telling Sting about the power of feeling and taking Lector hostage wasn't very smart in my opinion. Encouraging him to use his feelings of comradry and at the same time taking his best friend hostage? That's just begging for trouble later.