Expected this would happen, saw it a few chapters away. There's a reason why she didn't became a magic girl before this.
Also, let me guess, this manga will continue after this. SIGH, if it does.... I think I have to drop this. Not really a fan of this half baked military tactics. No seriously, somebody who is working for an intelligence agency either in Japan or the US should have seen this coming even thou they have little to no experience in magic. They might even been able to properly prepare and arm their troops to prevent all of this.