Sucking on jolly ranchers helped me. I normally don't like them, but sucking on them was better than the alternative. I also took me prenatal at night, with food.

Ginger is supposed to help, in whatever form she'd prefer, even drinking ginger-ale can help. Ginger didn't really appeal to me, but I was able to drink some ginger-ale mixed with orange juice.

And like someone already mentioned, B6 is supposed to work for some.

My sister-in-law was so sick that she was loosing a lot of weight (she was very thin to begin with) and she ended up in the hospital because of dehydration. Her midwife put her on a prescription to help with the morning sickness and it really did the trick. She'd take one pill every morning and she'd be fine all day.