That is kind of an odd gulping/burping behavior. One of my guys did similar but I never did get to the bottom of it. Ruled out a respiratory infection through a lot of testing. Possibly a reaction to swelling or irritation in the mouth or throat which would also go along with reluctance to eat. Do you see any signs of wounds or issues around her mouth, gums, tongue, inner beard etc that might be causing discomfort? Pulling the ear shed may have caused some pain but isn't necessarily related to this. I would be hesitant to medicate her without a solid diagnosis as the meds can do more harm than good. Do keep up with the baby food to try and get her some nutrients and
hydration. You can mix your own by blending up a veg mix with things like collards, turnip greens, squash, green beans, bell pepper along with water. Blend it to a smooth consistency then strain it to get the big pieces out and then run it through some cheesecloth or similar to remove just enough water to get it to baby food consistency. You can store this in jars in the fridge for a few days to a week or so at a time. I would also try bringing her outside for some natural sunlight when you can and see if that helps perk her up.