Any doctors out there? Question about death.?

My Mom is 88 years old and in intensive care. She weighs about 88 pounds. She has sepsis, renal failure, not eating, high heart rate and is having dificulty breathing. They also think that she is bleeding internally. They are treating her to save her - but she is suffering SO much. She is DNR. It is morbid, but the person who is in charge of everything is going on vacation for a week, and thinks she will still be alive when he gets back. The doctors say her death is not eminent. I don't believe it. Anyone have a clue ( I know that God knows...) how long she can last. She is suffering so much, I am hardly able to take it. Serious question - I am 55 and exhausted from being up there every day. Doctors won't be straight with me. Please guys, this isn't a joke. Serious answers only please, have some respect. Thanks.