ah! a subject near and dear to my heart!! I'm answering this question more broadly than just in the "baking sense".
Most "natural food" stores (such as Whole Foods) have specific gluten free areas, where you can find gluten free bread, pancake mix, cookies, pizzas, etc.
For a "take out" or "eat out" kind of environment, I've had good luck with Thai food and SOME Japanese foods. Sushi is ok, as long as it doesn't have tempura.
For changes to cooking, she should start thinking more about rice dishes and potato dishes. Pasta dishes are ok, but she'd need to get gluten-free pasta (which does exist!! Mrs.Leapers is my favorite).
Just an FYI for your friend, "modified food starch" CAN be wheat by definition. Anything labeled "Gluten-free" is a safe bet, assuming your friend is in the US. Depending on her sensitivity, something "made using equipement that processes wheat" can be bad.
Above and beyond anyhting else, read labels!!! I've noticed a tendancy to have allergy information under the ingredient list. BUT this is not a hard, fast rule.
Hope this helps!!