I did some searching and found a few things for you. I'm putting links to the censuses but if you can't view them let me know and I'll do screenshots. The other documents I mention I'm attaching. Everything took place in Digby.
I checked your tree to see which documents you already had so as not to duplicate. Note that you have to be flexible with dates and names. Many people in those days had only rudimentary reading and writing skills, if any at all. They usually knew their birth day but not necessarily the exact year. Their names might be spelled a number of ways. The person taking the information might spell them as they heard them.
I found Susan's (Susannah) marriage record to James Walter Doanen which lists her parents as Archangel and Anne. Note that Archangel can also be written as Archange and Archibald.
It appears that Susan (Suzanne) remarried on 17 March 1909 to a Leslie Melanson. On that record she lists her parents as Archibald and Danion.
I also found her death record of 10 October 1927. The information was given by her sister Eliza/Elizabeth (Mrs Joseph F Robicheau). She gives Susan's full name as Susan Margaret and her date of birth as 31 December 1849. She gives their parent's names as Archibald Comeau and Matilda Anne Thebeau.
So far I haven't been able to find a marriage or death records for Susan's parents.
Here are the censuses:
1871 Susan is living with her widowed mother Anne, her brother Archibald, and her sisters Eliza/Elizabeth and Jane:https://search.ancestry.com/cgi-bin/sse.dll?indiv=try&db...
1881 Susan is living with Walter and their children next door to her brother Archibald and his family and her mother Anne.https://search.ancestry.com/cgi-bin/sse.dll?indiv=try&db...
1891 Susan is living with Walter and their children next door to brother Archibald and family. Her mother is no longer listed so had probably passed away.https://search.ancestry.com/cgi-bin/sse.dll?indiv=try&db...
1911 Susan and Leslie are living in Barton, Digby. https://search.ancestry.com/cgi-bin/sse.dll?db=1911Canada&am...
I'll see if I can find anything else.