Have you and your friends save your money. If your friend really wants to lose the weight badly enough she would find a way to afford going to the camp.  Maybe she says that to you to make you think she wants to lose the weight rather than really being serious about it.  Because.....if you really want to lose weight you do not have to go to a camp to lose it.  Again, losing weight and keeping it off are two different things.  Check it out before you and your friends pay her way into gaining more weight when she comes home.