Cooravoy seems to be a variant for Corravogy townland (see entry on Placenames database at logainm.ie) or possibly Corravohy, the first is located between Drung & Ballyvin and the second west of Drung. Both are in Drung civil and Church of Ireland parish, which would fit as their place of marriage, which usually took place in the bride's parish. The records from Drung CofI parish go back to 1759 for baptisms, 1785 for marriages and mid 1770s for death burials so worth checking for records for Elizabeth her family. Historic records for the parish are held by the RCB Library in South Co. Dublin. Transcripts of baptism records for the parish of Drung & Larah are availabale on RootsIreland (pay-website), but they dont seem to include marriages or deaths yet.
Annagelliffe townland is located in the Civil parish of the same name and their registers go back to 1804. These appear to be held in local custody. RootsIreland include baptism, marriage & death/burial transcripts going back to 1802 for a parish refered to as 'Anna', which might be a short name for the parish.