A bit of googling suggests that no songs as Gaeilge were recorded by femaale vocalists with De Danann in the early albums. There are a couple on The Mist Covered Mountain sung by men. JTT's liknk seems the most promising and includes a link to "Moll Dubh" as I mentioned earlier. As far as I know the word Maidin doesn't feature in the opening verse of Jimmy mo Mhíle Stóir