I just posted on your other thread asking what her current diet looked like. But, what you'll need to do is to get her eating 6 small meals a day.
She should get her protein sources from chicken, fish, lean cuts of beef, eggs and egg whites, and whey protein. If she is going to eat dairy, cottage cheese, yogurt and skim milk are also good additions.
Have her get her complex carbs from clean sources such as oats, sweet potatoes and rice. Fat sources should come from olive oil, natty peanut butter, nuts and seeds and Udo's Oil or flax oil.
Obviously she should avoid sugars and processed foods.
She should be including some greens in their as well.
She should be trying to drink at least 12 glasses of water per day. If she tends to retain water, then she needs to drink more than that.
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My wife has a hypoactive thyroid and wants to diet!