Hello M.,
Be encouraged. It is not as serious as serious as you think. :-)
I have experienced similar issues with my now three year old daughter. A little background information. My little angel is my third and last child. She was born with a congenital heart defect called "Tetrology of Fallot". Early on she had some open heart repairs to her heart. After her recovery it took a concerning amount of time for her to readjust to her past eating habits. So although your precious little one did not experience such a serious medical condition. After I acquired 1st, 2ndk, 3rd ..... opinions from every pediatric specialist I could access, the consensus was that after a child experiences illness (no matter how typical or serious) it is common and natural for the baby to need to be re-habituated to previous eating habits. The general explanation I got was that the baby needs time to regain senses of control and to put a time distance between the association of food and eating with feeling of sickness and discomfort. So my advice is experience based. Just apply an abundant amount of patience, try not to show your stress at eating time, don't try to force eating, make meal time a regular family event, you can also offer smaller and more frequent meals, have fun, offer a variety of calorie rich healthy foods with various textures that are easy to digest. Focus on quality not quantity in food consumption and find ways to calorie load (add pediassure or carnation's instant breakfast powder to bottle feeds, blend-liquefy good fats such as avocado into bottle feeds. Also be mindful that if there is any significant weight loss, signs of dehydration, decreased digestive regularity (diarrhea, constipation, low urine output) these are not normal and are cause for concern. In addition it is always a good idea to have access to a medical professional that you can trust to give advice anytime. That medical professional should not in any way be dismissive or devalue your concerns at any time. In sum it sounds like your baby girl is in a natural readjusting period that is common characteristic in the recovery process. Try to relax and readjust with her. Illness with a baby is always difficult for a mom because we are so empathetic, and lovingly connected and invested in our sweet little blessings. I gave some red flags that I was advised to look out for and if you are unsure or concerned or even simply curious call your trusted medical professional. That is my long drawn out advice. Hope it helps.
God Bless
T.-Kira's Mom