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An isolation cage can be something as simple as a dog crate. That's what I've used in the past. It's certainly possible that what's bothering her isn't contagious, but if it was me, I wouldn't press my luck. Sometimes all it takes is for something to stress a bird's immune system (winter coming on, etc.) and they can succumb to an infection previously resisted. We lost our rabbit to a pasturella infection that had been dormant for all of her life but when she was stressed by a loud party held by our pet sitter (without our knowledge), she finally got sick with it.
If it was me, I would not keep feeding her all these different things. I'd go back to basics and give her plain water and plain chicken feed. That way you could be sure that you're not adding to the digestive upset with all the treatments. If she's losing weight, I would offer hard boiled egg, mashed up. It's nature's perfect chicken food, after all.