If she can never keep any vitamin down at all, I would suggest she see the doctor and find out if at least folic acid could be given in another form besides orally (like, maybe, a shot?) because it is so important. But if she takes a vitamin and then throws up, and it's an isolated piece of timing, I would not stress over it.
Incidentally, I used to have some natural multi-vitamins that made me throw up when I *wasn't* pregnant. I don't know what they used to compound them, but boy did they make me queasy. My husband also. Change the vitamin and the problem went away. If you want to test whether the vitamin itself is the issue, take one yourself and see if it makes *you* sick. If so, get a different brand for her.
I'm not sure about the rate of absorption of the vitamin but maybe she could switch to taking them right before bed? A friend of mine had the same problem and switching to nighttime helped since she was asleep by the time she would have vomited.
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