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Both parishes have continuous records in the 19th century. The Knockanore baptismal records start in 1816 and the Cappoquin baptismal records start in 1810. You may want to scan the Knockanore records around 1843 for Ellen.
I reviewed the Cappoquin parish register and the records are very legible but they do not show the townland next to each record so we can't confirm if the family moved but likely the family moved closer to Cappoquin church.Did any of the children stay in Ireland and get married? If they did and we can locate the civil marriage record, it will show the townland.