Not sure what you mean by earthy but to me it connotes simplicity, a natural sensuality, and a down to earth style.
I'd suggest jeans, flannel, tie-die, batik, paisley, Birkenstocks, Saris, Sarongs, simple accessories and chunky jewelry.
Go to Forever 21.. they have some stuff there that's earthy and fashionable, not too girly.
Shop at Free People. Things at Forever 21 are incredibly cheap and wont last you very long.
LOVE Free People! That's the perfect store for what she is looking for! Good call.
what exactly do you mean by earthly?