Hi, Korey
The middle name is easy since Eilish is Elizabeth, as well as Alice.
The other name is more complex since the name looks similar to anglisized versions of some surnames. But if you go by the translations of a names meaning (like with Elizabeth) then it becomes easy. Colleen! Which is translated as girl, which can also be maiden. There are other translations of maiden - maighdean and réamphósta - but I think Colleen is probably more user friend.
But your cousins might have other ideas on the matter, so it is worth polling them. Things are never just one way in Ireland, or in the Irish language.
And yes, Aoife is the Irish for Eva and sometimes Ave (although one friend's daughter is spelled Aibhe for Ava.)