The Andromeda Strain is a good one, they recently did a remake of it in 2008 with Benjamin Bratt and Eric McCormack. here's a link to IMDB with the summary plot.
http://www.imdb.com/title/tt0424600/
Try getting her an Encouragement card. I think sending a sympathy card is ignoring the fact that her son is who he is and feeling sorry for his mother insinuates that his life is something to feel badly about. An encouragement card should express the fact that you understand it is a difficult...