I'm six months pregnant and just now starting to feel human. I was so sick that I needed medical attention. I'll tell you right now that if nothing seems to work, she needs to get to the doctor for some medication. I couldn't keep water or food down. Every single thing I put in my mouth, I threw up.
I tried all of the above. The B-6 and ginger worked for a few days, then I was back at it. It kept getting worse and worse, and was at it's worst during my fourth month.
If she can't keep fluids down or can't keep any food down, she'll have to go to the emergency room for an IV and some Zofran (or something like it). I gained 10lbs in 3 weeks after I started Zofran (I'm still a couple of pounds behind). I had to take it three times a day for a few weeks, but now I just take it if I start to feel sick. I still avoid my "trigger" foods, but I can now eat normal foods (fruit, veggies, breads, nothing spicy, no meat, nothing with tons of sugar).
Honestly, I seriously doubt I'll ever get pregnant again because I was so sick! And when the OB says, "Wow, I've never seen it that bad!", you know you were bad off.