Tongue Seems Too Large?

by Ali
(USA)

I'm working with a 6 year-old little girl; she has a bit of an open bite, but most significant is that her tongue is just too big for her mouth.

It causes lateralization and frontal lisping on many sounds. She can most often be found with her tongue tip placed in one of her nostrils.

Her teacher and I cue her to keep her tongue inside her mouth when she's doing this.

With modeling and cueing she can use correct tongue placement for most sounds (typically the back sounds are lateralized); however, even when she uses correct placement the rest of her tongue is bunched up, making it awkward for her.

There just isn't enough space inside her mouth for her tongue. Any thoughts, comments, suggestions?