my mother-in-law has pulmonary fibrosis and is in congestive heart failure now she had been filling up with liquid for the last 4 days each day a little more. she has been on oxygen for her lungs for a few years. she is under hospice care and has been for few months. she is 82 yrs. old and its hard for her to breath or walk How can we tell how much time she has left. We need to fly her son in from California. He wants to be there right before she dies and hospice drugs her up. how much time quessing do you think she has left?