It sounds like she is hyperemetic (sp?) and possibly needs for the doctor to give her medication to help. Hyperemetic just means she's throwing up.. a lot! It sounds like it is really interfering with her day to day life too. Sometimes when it interferes with daily life the doctor will prescribe something like Zofran. It won't stop the nausea completely but will stop the vomiting from being so bad.
Some other things that are known to help:
Is she taking a regular prenatal? She can talk to her doctor about switching to 2 flinstones vitamins a day and b6. Sometimes prenatals are very harsh on our stomaches and that doesn't help when we're feeling sick.
Unisom- there's something in it that helps, but I can't remember what. I know a few pregnant women who were told to take it and they said it helped. This is something she would want to talk over with the doctor though.
Like others said too: preggie pops, sea bands, ginger tea/soda/cookies, saltines, flat soda helps some women, citrus flavored things like lemonheads or lemonade, peppermint tea, sleepy time tea, chamomile tea.
Also if she can find something that goes down well enough for food or drink then she needs to go for it. Even if it means she's drinking sleepy time tea all day (hey, its decaf anyway) and eating sandwiches. I noticed with this pregnancy that the more I tried to make myself eat certain things, the worse it got. Once I gave in and just ate what sounded good, things weren't quite so bad.
I hope she's able to find a solution so she can get a break from this.