My mother has water in her lungs and in critical condition, what is the best course of action?

My mother was brought to the ER because of vomiting and difficulty breathing. The doctors found there was water in the lungs. She is in critical condition. What is the best course of action?

Age: 79
Female
Medications: levadopa/carbidopa, pramipexol
General Information: Suffers from Parkinsons disease