NoodleDoodleDoo That (your post at 21:21:12) is one way of looking at it,
OR
you could look at the same situation by saying maybe 'they were all silly and giggly, and only got 1/2 way up the wall and wouldn't challenge themselves' because they weren't used to being with the lads, and were treating them differently from their guiding friends.
My dd does her climbing, (to use your example) with her Scouts (well, Explorers now) and treats all her peers the same, as equal friends. She has no issues to do with if they are lads or girls, she gets on with climbing and challenging herself.
That's not to say there isn't a place for 'girl only' activities for some girls, just saying that's how I'd read that situation.
I agree with all the posters who say what a Guide or Scout group actually do varies enormously from group to group, and is mainly dictated by the skills, experience, enthusiasm, energy, and interests of the particular leaders of that particular group.
My dc are in Scouts, and I've volunteered with Scouts Association for 30 years now, but I know some excellent Brownie Packs, Guide Companies and Ranger Units, and I know some weaker Beaver Colonies, Cub Packs Scout Troops and Explorer Units too.
We should be doing all we can to support each other, not making it into some sort of competition.