I read somewhere that if you have a child who is becoming overweight, instead of trying to modify their diet, you should encourage them to become more active. They stressed that having parents exercising with them would be the best option. Of course, you can always say it's about you, not them--that you, say, want to join a gym and think you'd be more likely to go if they go with you, etc. In fact, I might be remembering this wrong, but wasn't our very own amazing Meg encouraged to start going to the gym as a companion to her daughter? Or was it the other way 'round?

Anyways,
alinnell, perhaps you could get your daughter to exercise with you? I agree that getting her to try on the dress might be a good thing, but considering her feelings about you seeing her try things on, perhaps you should suggest she does it and then leave it up to her as to whether she wants you to see it. Trying to zip it in the privacy of her own room could be enough for her.
I totally understand how people feel in terms of wanting to share with others how incredible it feels to shed the weight and how helpful places like 3FC are. Like many of you said, it's not up to us to do, but the inclination to share this good news, knowing how it could transform their lives, is a common one, I'm sure. One thing you can do, if the situation warrants it, is reveal that you used to be overweight. Perhaps share a picture of you with family where you're overweight, without mentioning your weight. The opens up the possibility of discussion--if they want to ask what happened between then and now, they can. If not, at least they have the encouragement of knowing that it can be done and they also know that you're much more likely to be empathetic.
When I get into discussions about weight with friends or acquaintances (usually somehow centered around them asking about my diet) and they express their guilt or shame at being overweight, I am always quick to assure them that when they are ready, they will lose weight. I usually (badly) quote Anais Nin (the one about being ready to blossom) and do my best to encourage them not to beat themselves up for not being ready now. I hope that helps them. I do truly believe that--when they are ready, they'll do it.
I totally agree with all of you about how rude Shane's client was. Like many of you said, wake-up calls can be much more harmful than helpful, making you feel so bad about yourself that you only eat more. For some reason, when someone tells me, "You're too pretty to be fat like this" it makes me dissolve in tears.

Not sure why that phrase hits me so hard, but it's SOOOO condescending!
On the other hand, as many of you noted, interventions from those who truly care about you (and are friends) can be helpful. One of the many things that drove me to finally do something about my weight was a talk with three very good friends. It was informal and I don't know if they even discussed it before. They told me how worried they were about my health and about how I was hurting myself. They told me that they would be there for me and help any way that I wanted them to. They told me that I deserved a better life and they they thought I was beautiful and wonderful and worth it. It made me cry a lot, but it wasn't the kind of crying that comes with the "wake up calls" from strangers. It really moved me.