I had hyperemisis gravidarum w/both pregnancies. It always seemed to be the worse when it was "suppose" to be that time of the month, I was always in the hospital once a month for dehydration,also. I had a Reglan pump on me also, but still vomitted even with continuous anti-nauseua (sp) going thru my blood system.
Nothing I tried worked, nothing, nothing, nothing. So, after many failed attempts, I decided to just eat what sounded good. I especially ate whatever when I was feeling good. Gatorade, powerade, crackers, ginger cookies, nothing worked.
My advice would to tell her to keep faith that it will end and the end product is well worth the visits to the ivory tower.
I had it w/both pregnancies from day 1 to birthing day also. Some days the nurse had to come to me w/an IV bag, because I couldn't make it to the hospital!
Just tell her to hang in there, get plenty of rest and let people take care of her. For some this goes away after a few months, for some not.
Hope this helps.