My first reaction while reading the beginning few chapters was ... I've never read anything quite like this before, and I don't mean that in a bad way.
I read the story description first and thought, 'an old woman transforming into a magical girl? get outta here!'. And while the themes aren't as fully flushed out as they could be, this manga does present some pretty thoughtful questions. Using the experience that comes with age and combining it with a renewed youth, our obaa-san protagonist forgoes the traditional methods of stopping evil. Instead of using force and destroying those who don't agree with her, her power uses reason and emotions to try and solve the problem at the core. This is very interesting since it clashes with the typical methods that MCs in most stories use. The way that she interacts with other characters in the story is very different from what we're accustomed to coming from an MC in this type of story. And seeing their responses to this different treatment drives the point home further. I think that it does deliver a nice message that violence is not the answer. All in all, it is thought provoking.
Am I thinking about this way too much and over-analyzing? Absolutely. But, even without that in mind,「xx demo Mahou Shoujo ni Naremasu ka?」is a story that is fresh and entertaining. I do hope you chose to give it a read.