To be fair, my husband and siblings all went to the gaelscoil and their parents were from UK so not a word of Irish, and they did grand! There's also a boy from China in the gaelscoil here and his parents don't have Irish either. So it's not a prerequisite but obviously it helps.
My kids are in the gaelscoil now and I obviously have basic Irish that we all learned in school, but since the kids are speaking it, it has started to come flying back to me! So I doubt she really needs to do this course, but I do encourage the promotion and speaking of our language, so I can't begrudge her on this occasion. (She's still an insufferable eejit in all other aspects of her life though)