Well it has taken me a couple of years to come back to this thread :)
I did get a copy of the actual marriage entry, from the Catholic Church, a couple of years ago.
I believe I have a picture of Marie somewhere, probably picked up from the Glenbow archives.
I am not aware of whether or not Adelaide lived at the mission when she was younger, I haven't done much research on the Belcourt side of the family as I was focusing on the Glenns at the time.
I do have a webpage about John Glenn that includes information about their family and a bit about Adelaide too.http://johnglenn.ca/