"What do you do when you look around at your church, your peer group, other christian women, and they resemble the WORLD far more than they do the body of Christ!" I have to admit, my 1st thought is something along the lines of 'find another church'... but I do know what you mean, I think...
"At what point does it become the responsibility of SOMEONE (Pastors, Elders, Older Wiser Women) to challenge our resemblance to the world??"- I don't know if there is a concrete answer to that, but I think whatever the answer is, it has to start with us, ourselves, setting the best example we can... hopefully such a wonderful and godly example that our peers would look to us and actually want to be more like us, not feel pressured to be, but actually desire to be... but if we look just like the world, like them, then we have no place speaking into their hearts and lives about their apparent resemblance to the world...
People do need to be challenged to do right, in my opinion. It's just so easy to take the easy road, and the easy road is far less "right", if you know what I mean. But that challenge doesn't have to come in the form of a confrontation, except for maybe when it comes to blatant rebellious sin, but rather, again it starts with us and our own hearts and lives- if we are really doing right, and really living a life that is "set apart", enough so that people see a difference when they see us, that difference will challenge them, perhaps more powerfully and effectively than our words ever would...
Just my 2 cents' worth...