Help refusing milk and solids

Hi. My baby is 1 in just over a week. A little over a week ago she was brought home from nursery with a temperature and after a hospital trip over the weekend it transpired that she had RSV. She was really poorly over the weekend but started picking up on Tuesday/Wednesday this week. When she was ill she was drinking bottles of formula like normal but projectile vomiting them straight after because of her cough and how congested she was. She was barely eating and solids at all. As she has gotten better gradually and now just has cough and cold symptoms, her solid intake is improving only slightly but she is point blank refusing bottles of formula. She will start drinking normally and then all of a sudden stop and push the bottle away. So in a day she is now picking at meals barely anywhere near what she used to eat and is not having more than 3/4 ounces of formula in a day. I’ve tried changing up the foods I’m offering, offering them later, giving the formula in a tum tum cup, open cup, giving even blue milk in a tum tum cup and open cup, nothing seems to be working. She is now on the road to dehydration (she is the same with water, throws the cup or pushes it away) and I am now worried. How long should this go on and when do I panic? I’m worried she has developed a feeding aversion from being so poorly and trying to eat and drink and then vomiting afterwards. Thanks