All the Brooks saddles mentioned are 210mm wide, the S ones has got a shorter nose. No way this saddle is to narrow, it is the widest Brooks I can find.
I think the problem is the saddle is old and out of shape plus she is not used to it. Thightening the tension in the front a bit and lacing it may do the trick. There is quite a lot of threads about relacing old B72`s so I guess this is something you need to do when the seat is old.
To be properlu rested on the wide part of the saddle you need to tilt the nose up. My friend complained about a similar saddle being to narrow. I tilted the nose up and now she is happy.
My son is struggeling with deciding what changes should be done to the saddle position (alsothat it needs to be rised since he is growing). I no longer try to get opinions from him. I just usemy judgement and do what I think is best (little by little). Then I ask him how the saddle feels (and also judge by how it looks) and then I tell him I made some changes. He can tell if the nose need to go down but not if it needs to go down.
My B72 has got a crazy nose up angel.
http://i277.photobucket.com/albums/k...ewDogbike2.jpg