My husband was born and raised in Portland, Cumberland, Maine. We currently do not live there, but we are somewhat familiar with the geography of the area.
Regarding Cora Ellen, Pine Point, Cumberland, ME is actually considered to be a part of the town of Scarborough. I then checked the 1880 census for Cumberland County, Maine on Ancestry.com for a 5 year old named Cora with no last name entered. I found a Cora Richard living in the household of John W. Webster in Scarborough, Cumberland, ME.
Here is the entire household listing:
Last, First, Race, Sex, Age, Birthplace, Occupation, Father's Birthplace, Mother's Birthplace
Webster, John W., W, M, 34, NH, keeping of town farm, NH, NH
Webster, Catherine B., W, F, 34, ME , keeping house, ME, ME
Skillings, Staloria, W, F, 70, ME, Servant, ME, ME
Richards, Daniel, W, M, 67, ME, Teamster, ME, ME
Burnham, Drusillia, W, F, 65, ME, Servant, ME, ME
Snow, Samuel, W, M, 56, ME, Fisherman, ME, ME
Richard, Cora, W, F, 5, ME, At School, ME, ME
I know that this raised a lot of other questions, but hopefully it helps get you pointed in the right direction.