I dont have anything on her marriage or descendants but if you want to know about her ancestors I could send a Gedcom or a an Outline in an email.Also I have a subscription for online Census. If you know her husband's name I could do a look up for Michigan. (I have about fourteen pages of Ashbel Treat + Dorcas Goodrich's descendants)
Also you may want to contact Cheryl Deuel, she is a local Treat genealogist and may have more on the descendants of Mary E. Treat and siblings, as she was once married to one of the lines descending from Philo Treat and Polly French.
Her email address can be found from the top of this thread.