While the McCuskers (and a variant spelt McCosker) were resident to the locality sometimes referred to as Eskra (Eskragh), it does not necessarily mean that they lived in the townland of Eskra. My great grandmother was a McCusker who married into the McCarroll family of Corkhill. Catherine passed away in September 1916 and it appears that she was living at that time with her unmarried "children:" Hugh, b. 1883, and Jane, b. 1881.
You note that Margaret was buried in Eskra - but the graveyard and chapel are actually in the townland of Lisnarable.
Confusing? Yes, it is - but, as Aghadowey points out that it unfortunately is difficult to obtain information of the more recent ancestors, but it is even more difficult sorting things out when the townlands are confused with unofficial localities such as Eskra.
My Catherine was from the townland of Agharonan yet she lived for a while in Cattor, moving still to Legamaghery. She even lived with one of our cousins, over at Curr. How then are we to connect these places when they all come together at the graveyard in Eskra, but actually is in the townland of Lisnarable? You could start with Margaret's gravestone and the Eskra Roman Catholic chapel.
There was a Maggie McCarroll who entered at age 10 Fintona's school, previously from "Eskra" but she left that school February 11, 1923. Her father was listed as a publican, as was my grandfather and both were in Fintona at that time.
You might want to obtain a map that will let you know just what the townlands are around this area.
I raise thes points not to argue but to show you how difficult it is to locate long, and not so long, lost relatives. By the way, do you know of Maggie's maiden name? That may give you a clue to where you start to can find her. Who knows, she might have been that Maggie Carroll.
