I went to three different all girls schools over the duration of my schooling, as well as four coed schools, one of which was a comp in the UK. One was a smart independent boarding school, the other two were semi state funded but with a long history of educating the upper middle class girls of the area.
The best education I received was at a non-UK coed high school. It was inclusive, supportive, fun, and academic enough without forcing pupils down that road.
The girls' schools certainly were a very good fit for many attendees, highly academic and focused on building confidence and so on. The issue is that there is often a real hegemony around what it means to be a girl, when it comes to girls schools.
It was about building confidence in being a very specific type of girl, I suppose. Being gay, odd, fat, foreign, highly sexed, assertive, outspoken, angry, etc etc - anything that isn't white-bread classically feminine/girlish in a very specific western sense of the word - was aggressively quashed by staff and fellow pupils alike.
That was my experience. I was struggling with a hard home life and was very sexual from an early age - this combined with being a questioning, dissenting kind of person meant i was severely hemmed in and penalized for existing. For example one school asked me to leave as a punishment for shaving my head, which looking back was so absurd. I was being sexually abused and was acting out. It wasnt really brain surgery and "inviting me not to return" to the school was a clear "fuck you" to a child who was struggling and needed support.
They really wanted girls who were "respectable", modest, sweet, accommodating, etc while publicly saying that they were helping mold future female leaders etc etc.
If your dd would thrive in a more conformist environment, it might be a good fit. I needed more space to exist and figure things out. Depends on the school as well, some have wonderful pastoral care that might be much more accommodating of all types of girls.