My sis had a massive brain aneurysm December 22 2006, they coiled it that night late, I cannot remember how long she slept, but then the crazy thing ruptured 2 more times, so coiling was obviously not the answer. She has been through hell 3 times, finally they decided to just clamp it this July 2007. Your mom is older than my sis, she is 57. I do believe that age plays a part in it all. Be patient, pray, and I am sure she will eventually awaken. The brain is a very complex thing, the doctors are even perplexed by it still. I wish the best things for you and your family.