Sorry your girl is poorly. What medications did you get?
You will need to syringe feed her if she’s not eating. Do you have critical care? You can make a pellet mash and syringe feed that if you don’t have critical care. Keep offering favorite veggies to encourage her to eat.
Her ears might cold because she her body temp is low, which can happen when bunnies are in pain and can be dangerous. Can you take her temperature? You can heat up a warm water bottle and place it near her under the blanket, just make sure she is able to move away from it if she gets too warm.
That said, ears can be cold even if the body temp is OK when the room temp is cold. So taking her temperature would give you a better sense.
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.