Your Vet is your best person to help...................the liver has had some damage which is giving the symptoms of Jaundice.
As she has had antibiotics, the gut flora have been eliminated so get some LIVE yoghurt, not pasteurised, and using a dosing syringe, gently give it to her down the side of her mouth. I would give at least 100ml twice a day Live yoghurt has amazing properties and will often help a sick animal to eat properly.
Don't worry about the size of her belly.......that is the least of your concerns..........a goat that doesn't eat is a dead goat. Find some Ivy leaves, bramble tips etc some fresh green hay., choice branches,