Here's her second marriage certificate. His name was Kezekiah King. Hope this helps a little.
I don't know any of their death dates, but I've included a link of the online Montana Death Index. It's seperated by decade then sorted alphabetically and in later years lists what county as well. I would suggest taking a look through it to track down the dead children you're looking for. http://www.rootsweb.ancestry.com/~mtmsgs/death_records.htm