I'm not currently a WW member, but I read everywhere, so I tend to post everywhere if I think I can help.
It's great that you want to help your friend. Remember though, you can't do anyone else's program for them. When you get wrapped up in helping someone else, it's easy to lose focus on you.
Also, WW is still going to be a customizable plan. When the WW plan as written doesn't seem to be working for a person, WW leaders will still sit down with a client and help them tweak the plan to make it work.
For example, when I was a WW member, I was in a group with a woman who couldn't lose weight on her point alottment. She was older and had low-thyroid that her doctor wasn't willing to medicate. After weeks of working the program (she swears dilligently), her leader had her drop her point level to a lower level. That's still following the program, even though it's not "written" that way. WW has contingency plans to customize the plan to an individual's needs.
For me, if I were to sign up, I know that I could very easily overdo fruit to the point of stalling. I've done it before. I could wait until a leader told me I had to cut back on fruit, or I could use common sense and know this about myself. I would bet (and win) that I couldn't eat unlimited fruit and lose. Heck I've even stalled on an all-fruit diet.
Most people won't gain weight on fruit - but I can and have. That doesn't make free fruit a bad idea from WW's standpoint, but it does mean they'll have to work with people like me, and customize the WW plan to us. You can also bet that someone who does stall on fruit isn't going to be told to quit WW, they're going to be told to stop eating so much fruit.
It could be written in blood, and some people are going to do whatever they want and call it WW. You can't help that, and it's going to drive you crazy if you're trying to monitor her and yourself. Let her learn on her own, if that's what she needs to do.