My mother battled colon cancer (and ultimately lost her battle) 2 days after chemo she barely had to strength to let someone bathe her let alone get up, make her self presentable, get in a car, take even a short car ride then sit through what a wedding let alone a TELEVISED one that may have had to stop, start, do retakes etc. Cancer and treatments effects everyone differently depending on your health and how much of it has spread and where. Perhaps she is in such a state (as my mother was) that she didn't want people gawking and staring and for her last days to be remembered on camera. I think it's perfectly reasonable to have missed his wedding. She had no way of knowing it would work out or not and I'm sorry as sweet as Jason and Courtney seemed her son agreed to marry someone he never met and I'm supposed to leave my death bed to support it? How about you bring the wedding to me.
Sorry if my post seemed agrumentative because I do not mean to come off that way. I guess this is just a very sensitive subject for me :)