If you can setup a phone with a free audio recorder and just set it near them as a story starts.I'm sorry. Even when we sense that it's time, it's hard to watch a loved one go downhill. There is just no easy way to go through this, but if I can make a recommendation, laugh a lot! Get your Mom to sharing stories. Share your own. If you can't record them, write them down. As hard as that is, now, you'll be ever so grateful, later, especially your DD. And remind your daughter that, no matter which side of the rainbow her grandmother watches from, she'll be watching with love and pride in her heart.
Many, many hugs to you all.