My 90 year old aunt has CHF. Her BNP jumped from 743 to 1198 in the last two months. The care facility monitors her blood every week as her potassium levels have been up and down due to the medications she is taking to help her excrete water. Her weight jumps up and down between 91 and 108 (sees very tiny). Other than being tired, she seems fine for her age. I stayed with her for 7 weeks recently. She wants me to come back to be with her (I live about 8,000 miles away and have my own family. How can I tell when she is nearing the end of her life? I want to be there for her but have responsibilities and work at home also.