Picky eaters

Anyone have a child who literally won’t eat ? My one year old has Always been a picky eater , but I could always get her to eat some her food , she had a cold that lasted a couple weeks which made her lose her appetite, now she won’t eat anything not even the foods she used to love. I’m getting extremely concerned because she’s losing so much weight, I’ve already made her a doctors appointment, but is there anyone out there who’s going or gone through this ? What did you do to get them to eat more , have you tried pediasure?? I just need suggestions my poor little baby is a twig now 🤦🏽‍♀️ lol