Also as far as songs go, the song of Eärendil (which I sing in Czech) seems to be good for putting to sleep (well, I guess it is repetitive enough to pick up the pattern). Last time she seemed especially happy at the description of armour and all the other equipment. Other ones I have exposed her to (also in Czech) were the second version of the Dwarven song (the wind over withered heath), the song of Nimrodel, and a bit of Gollum's song.
Plus, yesterday when we were typing our respective rants about the RoP, she was present and
Lommy showed her the very 'Downs and she reputedly seemed interested