also red raspberrry leaf tea is a time tested tonic for pregnant women. its full of nutrients and helps to balance hormone levels.
som egood vegetable broths will be very nourishing for her. some suggestons to add to the broth are greens (any green - spinach, kale, dandelion, etc.) garlic, onion, potato peels, celery, beets, carrots, and any other veggie that strikes your fancy. add some qulaity Sea Salt (like celtic or himalayan), and serve with a bit of black strap molasses and a squirt of lemon. very soothing and nourishing.
also some kelp everyday would be great. its high in minerals and all kinds of wonderful nutrients.