Hello!
I'm 15, so I understand what your daughter is going through. First of all, I love answering questions and talking - if your daughter ever needs someone around her age to talk about ordinary things or this fear, I would love to help. My facebook is my name ^^.
I have GAD, undiagnosticated psychosis, undiagnosticated depression, and emetophobia. Also, food issues are very normal around emets. I only eat two things - french fries and pasta with cheese. I'm trying to change, because eating those things made me gain A LOT of weight this year. So far, 25kg (55 pounds). I want to loose it all, so I'm slowly trying new things. It's working. Since the beggining of this year I tried like, 20 new foods.
Your daughter is underweight, but you know that. Slowly, offer her new foods. Fruits, first, fresh and washed. My parents used to offer me trips when I did something nice. Like, get good grades at school and we'll give you a laptop. Maybe you could ask your daughter what she'd like to have and make a deal with her. Also, consider taking her to a nutritionist.
Oooh, I have that too - I don't use clothes or blankets or foods that remember me of my stomach virus episode last year.
I agree with you - this forum is really trigger, and if she has bad emet, most likely she'll be scared or she'll gain more OCD habits. However, how do you think she would react if you told her that you found a girl around her age with the same problem? Does your daughter have friends? I only ask because I don't, that's why I always offer myself to help others.
If you mention me to her, tell your daughter that I wish all the best for her, and that it gets better. Don't ever let her think it doesn't.