Found this discussion yesterday:
Learn to play as an adult - piano or guitar?
The consensus seemed to be the guitar if you wanted to be able to play passably in public soon and the piano if you wanted to learn music theory (which could be beneficial later when learning other instruments). The guitar is more portable and more people know how to play it.
From past comments by people who have worked with Haley, she is already well-acquainted with music theory.
So what do you think she'll concentrate on?
I would guess the keyboard since she purchased one earlier. And she has memories of her grandmother playing the piano while the family was gathered around it. Plus, it's more common as a songwriter's tool.