The one thing to remember is that she needs to replace the
nutrients she is no longer getting from meat with other food. Major concerns for most people are protein, iron and b12(although they shouldn't be since they are easy to get).
Protein
The average person only needs about 50 grams of protein per day. Protein is in everything, just look at the side of boxes. In todays world it is very hard to be protein deficient if you are eating a wide variety.
High protein foods include:
soy milk, tofu, nuts(Almonds, Cashews, Filberts, Hemp Seeds, Peanuts, Pumpkin seeds, Sesame seeds, Sunflower seeds, Walnuts (black)), seeds, legumes(Garbanzo beans, Kidney beans, Lentils, Lima beans, Navy beans, Soybeans, Split peas), grains(Barley, Brown rice, Buckwheat, Millet, Oatmeal, Rye, Wheat germ, Wheat, hard red, Wild rice), vegetables(Artichokes, Beets, Broccoli, Brussels sprouts, Cabbage, Cauliflower, Cucumbers, Eggplant, Green peas, Green pepper, Kale, Lettuce, Mushrooms, Mustard green, Onions, Potatoes, Spinach, Tomatoes, Turnip greens, Watercress, Yams, Zucchini), fruits(Apple, Banana, Cantaloupe, Grape, Grapefruit, Honeydew melon, Orange, Papaya, Peach, Pear, Pineapple, Strawberry)
Iron
Like vitamin B-12, iron is a crucial component of red blood cells. Dried beans and peas, lentils, enriched cereals, whole-grain products, dark, leafy green vegetables, and dried fruit are good sources of iron. To help your body absorb non-animal sources of iron, eat foods rich in vitamin C — such as strawberries, citrus fruits, tomatoes, cabbage and broccoli — at the same time you consume iron-containing foods.
B12
Vitamin B-12. Your body needs vitamin B-12 to produce red blood cells and prevent anemia. This vitamin is found almost exclusively in animal products, including milk, eggs and cheese. She can also get vitamin B-12 from some enriched cereals, and fortified soy products.
I would suggest she pick up a few recipe books or look online. Variety is the key to any healthy diet. If she is eating different fruits, veggies, grains, nuts, seeds, etc daily, then there should be no cause to think she is lacking anything nutrient wise.