Hi Boom and Lucky Lady,
Bossman hit it right on the head. As did so many of our wonderful forumities.
Do not have her diet. Eat a lot of everything.
Variety is the key to make sure she gets all nutrients in her body. Over the course of a week she should be eating a wide range of foods. Especially due to the fact that her taste buds are going to drive her food intake, she should be eating different foods every day.
For example, to meet her fat requirements (essential fats plus general fat for vitamins and healthy eating) one day she might eat scrambled eggs (with the yolks ~ 2), drink 2% milk, use olive oil on some steamed veggies or salad, and eat salmon.
Then the next day she might eat ground flax in her oatmeal with a cup of lower fat yogurt, then have handful of plain, unroasted nuts (eg. Walnuts which are very high in the n-3 EFA ALA), take some fish oil capsules, drink soymilk with her high fiber cereal (I like Fiber One with psyllium), have canola oil on veggies, and have a small steak later in the day.
As long as she rotates her intake throughout the week, she won't cause any deficiencies, and she shouldn't have problems with allergies (like allergies to soy, which someone mentioned).
In regards to fat supplements, unless she absolutely loses her appetite and can't eat enough fats each day, I would supplement with a omega 3,6 oil blend (capsules or liquid). Then, no matter what, she should take fish oil capsules each day. She can take about 9 on days she doesn't eat salmon, sardines, trout, or herring; and then take at least 3 on days she does eat those fish. Don't bother with CLA right now. It's a fat that is found in red meat and dairy fat, and is mostly useful for fat loss in obesity, and as an anti-tumorgenic agent in cancer.
Her protein requirements are actually higher than non-active individuals because of the protein needed to grow a healthy baby. She should get at least 0.8g/lb of body weight. And since she'll be eating a lot of food throughout the day, she might even eat more than this, which is not a bad thing at all. Protein powders might be helpful if she develops an adversion to meat and fish or eggs (which some do).
Alrighty, Let's see what else everyone has to add.