I would test your water & see if somethings high like ammonia that might be making her sick. After you take a sample of the water do at least a partial water change. Do you know if your tap water contains any metals or ammonia that could be effecting her? Maybe test your tap water as well.
She might be sick with something unrelated to the water but I will leave that to the experts.
She might be sick with something unrelated to the water but I will leave that to the experts.