They have the correct amount of fibre in them that a person requires on a daily basis, like the dairy choice.
You can't base the lack of weight loss just on the SW hifi bars. Or just over 1 week. Saw have a money back guarantee. If you don't lose any weight at all within 4 weeks, and you've proved that you've stuck to the plan 100% with food diaries, you get your money back. Maybe she needs to give the plan more than 1 week to have an effect?
I eat 2 of the chocolate orange hifi bars (6.7g sugars per bar) every day and when I stick to the plan 100%, I lose weight. Sometimes up to 3.5-4lb a week.
The reason I'm still fat and have put on weight when I have is because I've not stuck to the plan.
The bars also help curb cravings when I have them
Granted, like a lot of things, SW may not be for everyone.
Personally, I know it works for me because I've done it before and got to where I wanted to be. Circumstances changed that, but I'm confident I'll get back there because I know I like following SW.
Maybe it just isn't for your friends friend. If everyone stuck to the same things the world would be rather boring wouldn't it?