Sounds like a nice Bat Mitzvah. Every family is different and each family is entitled to do it their way. It’s a perfectly good hashkafah.
In Europe, Bat Mitzvahs were not celebrated, and most often neither were Bar Mitzvahs. Today there are many celebrations big and small for many events and a Bat Mitzvah is one of them. If someone doesn’t like it, say no, thank you, and stay home.