This is something the japanese do well, they usually keep the feeling/form of the characters and don't just age them up like crazy compared to like korean stuff. Gotta preserve the power of lolis.
For a second I was like "Wait, is this from the same artist that made the official 3 fairy mangas?" and then the fairies appeared and everything made sense.
I feel like it's kind of special to have a person that you can depend on like that. I would rather call it healthy support and a shining beacon in her life.