Agree with most of these replies. Have/had 3 DDs going through GHS and also have worked in education as well as psychology ..and now give talks to parents of teenagers. I can see where your friend is coming from to a degree but it depends how you look at it and interpret it as a parent. If you support the GHS ethos and 'way it works' as such, and reinforce from home how well she is doing, then it will be right for your DD. GHS only becomes power house and too pushy when you get pushy parents always wanting their DD to be/do better!
The atmosphere is such that girls are incredibly hard working, not from the school pushing or setting excessive amounts of homework, simply from the selective nature. All 100 (rough!) girls in each year group are very bright, most have parents who share the same thoughts that they want their DD to have an academic education. Apart from that, they all are very different you get the sporty, the musical, the quieter, the loud, the actresses, the girly girls, the more qwirky etc etc.
I can't say GHS does anything but provide for all. Yes, if your sporty you get to play in the team but if your not you play in lessons and you can play for your house or fun...But they aren't going to force every girl to be interested in things she isnt. Likewise, there is house dance, house drama, house cooking.. the list goes on, catering for every girl.
I guess something you have highlighted is does GHS let girls try new things and push those who aren't natural 'have a go' types to get involved.
From my experience they do to the right level. One of my DDs was I guess a 'floater' she was happy with a good group of friends, did well academically, liked school and quite content with 'just being'.
Her form tutor noticed she wasn't doing anything extra curricular but also, more concerningly, wasn't joining in things like the form dance competition (nearly every other girl in the year took part in some way). She had a chat with DD, very sensitively and recognising the issue was confidence, not laziness. her tutor build her self-esteem up- little things like asking DD to be in charge of the form's charity event. While my DD was allowed to be herself and not pushed to join a sports team or anything DD was just not interested in, last year she was in sixth form and was a deputy house captain and definately valued by the school despite not being 'top' academically, in sports or music or whatever- just for being herself.
...Sorry this is getting long!!...
As OP said, its life that at times some outshine others, things can be competitive and GHS instills the work ethic which means the girls do so well beyond school. My elder 2 DDs are both at/finsihed uni and look back at GHS with great memories, pride and feel it really set them up to succeed in life, not just in their career but also from nurturing and celebrating each individual and i can see in my DDs and their school friends very strong values of love, care, morals and living life with enthusiasm and resilience. Most of all, I see how down to earth the girls are.
I have never seen GHS fail a girl, girls all have varying experiences because they all present different traits, talents, weaknesses etc to the school. I know girls who have goen through terrible adversity and the school supporting them incredibly well, really picking them up and sending them off in Upper sixth confident and well-equipped strong girls. As with all girls, there are girls who find the teenage years very difficult and I cannot express how well GHS is able to help the girls and keep them on track.
I can see why you are worried by your friends post, and for me, as a parent, I found the key thing is to truely support the school, and remember she is comparing herself to 99 other very bright, often very pretty, very talented, girls. You need to be reminding her of this and that she is equally as bright, talented etc etc. I have seen parents fall in the trap of comparing their DDs to the other girls, pushing them to do more but not also instilling the idea they don't have to be perfect at everything, its about having a go and doing what you enjoy. She is only going to sink if she is drained of confidence and never praised ...and the first place she wants recognition of what shes done right from, is you!
Hope this helps- sorry I got a bit passionate about it all!!