Hi, I am so sorry. My husbands lungs are that way now. When they gave him IV's he was worse, just drowning in fluid on the outside of his lungs it was full. He would even stop breathing for longer that i could hold my breath. He did that for about a week after the IV to hydriate him. He got better..then his lungs are filling up again. Sounds like marbles in his throat.
Hospice told us that if we tried to force fluids just drinking them...more than his body could handle any more...that it would collect on the OUTSIDE of his lungs AGAIN. I see that happen..he feels better ,,drinks more fluid..gets more around the lungs, then he is down fighting to breath again for a few days...on and on. But, My husband's organs are shutting down. He is giving a good fight to stay with us, though..
I wish the best for your sister and you, hugs and my prayer, Donna