One other thing she might need to know: on most ocarinas, there is a steady rise in breath pressure required as you go up the scale. On the Night by Noble, there is a spot around G in the middle of the range where the linear relationship breaks - she may find it takes more pressure to play the F# in tune than the G. I find this rather disconcerting, but if you know it's happening you can work round it.

Playing against a tuner is essential.