Hi there Peter, it is crazy bussiness this morning sickness, I remember crying because I was so hungry, but throwing up if I ate something. I found that small nibbles of what ever I could stomach frequently was better then a full meal. Salty thing like chips worked sometimes nothing that was battered or oily. I found that if I thought about a food before I ate it , I could gauge how it was going to effect me lol. Maybe ask her what she thinks she could stomach, then prepare it for her.
Keep up the water again small sips usually work better if feeling sick.