I actually lost quite a bit of weight during my first trimester. It's very important that she takes her vitamins since she can't eat. Have her ask her doctor about prescribing Zofran. It's a Category B drug which means it's safe to take while pregnant. This worked wonders for me! I still have my moments where nothing appeals to me even in my 14th week. I often get my mind on something specific and that's the ONLY thing that I can eat. As long as she isn't underweight and continues to taking vitamins she should be OK. But don't take it too lightly, have her see a doctor to check everything out. Ginger Ale also allowed me to at least eat light. I would force a piece of bread. And for some reason cereal always went down well.