I found the Carlson, Calvert, Custer, Wolfe, Wolf, Candieas Family Tree, http://trees.ancestry.com/tree/17021559/person/1525441059
and Emma is listed in that family tree. Most of the info you provided is on the family tree too.
However, I'd verify all info from the tree because I'm seeing more and more unverified or sourced info being published.
You can contact the Montrose County Clerk & Recorder, www.co.montrose.co.us/index.aspx?nid=72
to order a copy of her marriage license. It does look like her marriage to Silas was her first one.