Just a couple of quick, easy suggestions - Buy fresh ginger root and add a chunk to hot water to drink like a tea. Drink Peppermint Tea. These help with naseau.
These might help her a little, but she'll need to address the systemic problem that's making this happen. Could it be parasites? A viral infection? Could she be pregnant? ( I don't know from your post what her age is ). When and under what circumstances did this begin? If you can, try to find out a little more about how this began to gain some clues to point out the direction to go. If it's serious, she should get to a good alternative doctor if she can.