G.B.
Definitely try some music classes! I teach piano at the Suzuki Orff School of Music in Chicago (Chicago Ave close to Milwaukee) and we have great toddler classes that lead to Orff classes. DePaul School of Music Community Division should also have KinderMusic classes. If you're in the suburbs, there are great music schools throughout the area as wel. I would probably encourage to take classes at a music school rather than a toddler play center, because I think the quality of teaching might be more consistent, but it's up to you. Just continue to immerse her in music - lots of listening (to all styles, even classical and opera- they love it!), singing together at home, and some music classes (although I would wait with individual voice or instrument lessons until at least 4). Good luck and enjoy her talent!
http://www.suzukiorff.org