Was this a real social gaffe?

A new couple joined my art class and one of the partners is in a wheel chair and has vision and possibly speech issues. It seems likely a newish condition. I had e-mailed the teacher with whom I’m friendly about a few things and also asked her if she could tell me what J__’s illness was. I also said it was fine if she couldn’t/didn’t want to. I haven’t heard back from her.

I am wondering if my asking was really inappropriate and if so, should I apologize to the teacher? Or should I just let it go?