I'm really noticing a difference in the way she used to drink. I'm wondering if that is the problem and maybe she is just dehydrated and won't eat the food because she doesn't want to drink. She doesn't lift her head back and make those cute noises when she used to swallow. She just has her bill in the water face down and smacking her bill making the water splash but no obvious swallowing
Could you bring her inside for a swim?