I don't have experience with food problems while pregnant, but I have been pregnant and I have had a second-hand experience when my husband was facing a serious illness. I'll address his illness first. He was diagnosed eight years ago with Hepatitis C. He read everything he could on the internet and at the bookstore. The current information he found was he had at best 5 years to live. When we met with the doctor to discuss his treatment, we learned the Internet and books were not up-to-date and he has since been cured. POINT #1 Don't stake her situation on what you read.
Point #2 is if you are a believer, keep the faith. Know that whatever the outcome, God has a purpose and plan for those who are called according to His purpose and will. (Romans 8:28)Pray that your faith will be increased, for peace of mind, and for God's grace to sustain your family in this situation. Ask for healing of any lasting effects from the virus in your daughter's body - NOTHING is impossible for God. Get the prayer chain going through your friends, church, etc. There is power of prayer. If your family are not believers, I pray you will seek God, for if you seek, you will find. If you don't know where to look, begin by reading the Bible's New Testament book of John, talk to a pastor, or someone you know who walks the talk.
I assure you, God knows you and loves you. There is nothing more precious than human life to God.
You and your family are in my prayers.