Well, the first thing I'd do is keep her off Duolingo!
One book I can think of that might appeal to a youngster is "Enjoy Irish" by Eithne Ní Ghallchobhair. The lessons are short and not overwhelming, and the cartoon format might appeal more to a child of that age than some other resources. You can also get an app for your smart phone that has the conversations from the book (I'm guessing that, at 8, she doesn't have a smart phone of her own, but that she enjoys playing with yours).
http://www.siopagaeilge.ie/products/C%F ... ct1-26.htmThere are also computer programs available that include games and such to keep the learning process fun. I had one that I found particularly enjoyable...it's down in my car at the moment (I brought it to class last night), and I can't recall the name, but I'll bring it back up later and post that info. Not sure if it's still available, but if it is, it's worth looking into.
There's also BYKI, whicb a lot of people swear by:
http://www.byki.com/fls/free-Irish-soft ... nload.htmlOnce she gets to a certain level, there are lots of children's books in Irish, as well as a line of graphic novels based on Irish myths and legents, that she might enjoy.
Redwolf