I havn't had any luck identifying Ellen. There are many immigrants named Ellen in 1912, lots from England. And since the 1920 census isn't very clear, I'm not even certain that 1912 is the correct year. I thought she might appear in the naturalization records with William since they were together in 1917 and 1920, ostensibly married, but I didn't find her. I didn't find any useful records in Maine, either.