Get her lessons, at least to start with the basics. Then let her play to her hearts content.
A few years ago I paid for piano lessons for my grandson. He may have been a bet young at the time but seemed interested. We had an older electric keyboard we bought before my wife decided she wanted a grand (another story) and we let them have it. The biggest problem, at least to me, was his parent(s) complained too much about the noise and discouraged him.
Same thing happened when he decided he wanted to play sax. But I also think that was because one of his friends also wanted to play in the school band.