Thank you all! After reading about water belly, I'm fairly certain that's what is wrong. We have a bird vet not far from us, so I will take her in now that I have an idea of what it might be.
Initially, I did think she was just fat, as I read that that can happen. However, it's definitely...
My Indian Khaki female is very bloated. It's all fluid - you can feel it. She can not get in or out of the pool, and can't run very fast. Her belly sometimes hangs on the ground, and then it'll get a bit smaller. It's bigger again right now. She doesn't appear to be in bad health otherwise...