I can see I'm one of the few here hat thinks the two can be compatible; I think combining the WW approach w/Berardi's 7 habits would work great. A couple of good things I've seen w/WW is the support system, and most everyone I've seen on the WW has portion control down pat.
Like Stu said, she's headed in the right direction by at least starting WW, and that's a good thing. Right now, just be supportive, and rather than telling, kind of tactfully suggest.
Agreed, combining the WW approach with berardi's 7 rules has been the key to continued success for me. Once the "goal" weight is achieved, lose the WW points deal and stay with berardi's rules... the FAT will not come back, but muscle will, provided there is exercise in the equation. Like i said, WW is good for losing weight (some fat, and muscle in the absence of exercise).. but in the long run she needs to think about keeping the fat off.
WW- Short term losses, learn to use berardi's while on WW.
Berardis- Long term. keep it off and feel great while eating plenty. Don't fall back into the habits that added the unwanted lbs.