I'd suggest looking for someone who is accustomed to teaching piano skills to entering music majors at the college level, as those students more or less match her current profile as a musician. Pretty much every university-level music degree program requires piano proficiency as a core skill, regardless of focus area (instrumental/vocal performance, theory/history, education, technology, etc.), so some variation of this situation should be familiar to them.
My thought on pianos is that, until you have some sense that her interest in piano has a decent chance at some longevity, it may be a disproportionate investment in money, space, and maintenance to acquire an acoustic piano. I'd probably go with a reasonable grade of weighted keyboard first.
