I'm actually following WW so I'm a little biased
(So far 77 lbs down fitting WW around my life!)
But, if you're looking for a way to be able to eat a little bit of everything & control portion, then WW or plain old calorie counting are the best ways to go. I love WW because of the meetings, actually. They've really kept me on track.
Others find that cutting out the foods that kept them down in the past (breads, carbs) has helped them have better control. I knew right away that would simple never, ever work for me. But, you may think it could work for you! This is about finding which plan will help us individually. So, the same goes for your DIL. It may work wonders for her, but may not be for you...
I'd suggest that you go with your gut instinct first. If you'd like to try WW, then try it! Give it some time to find out if it really does fit your lifestyle. Either you work the program, or you have to find another one (this may happen). It may even be that for a time WW works for you, but then a time down the road you choose to try something else. This is perfectly normal.
The reason I suggest trying what you're initially interested in, is that you may be able to make a better commitment to it in the beginning.