Should I be a witness to an incident my friend sees as racist, even though I don’t think so?

I included the race of those involved for context, but I can remove it if necessary.

I (24M, Asian) was in class yesterday with a friend (25F, Asian, we aren't particularly close) who was born in China but adopted by an American couple and has lived in the U.S. since she was a year old. Before class started, our instructor (50s, F, Italian American) and some students were discussing the upcoming Lunar New Year celebrations. At one point, the instructor asked my friend whether she considers herself American or Chinese.

She seemed a bit taken aback by the question but answered it nonetheless. A few minutes into the class, she stepped out and later texted me, saying she felt offended and was heading to speak with school administrators.

This morning, she reached out again, asking if I would write a synopsis of what I saw and heard in class—presumably for a formal complaint. I really don’t want to get involved. I know the instructor well; she has lived and conducted research in China for years, and I’m confident her question wasn’t ill-intentioned. Even if it could be seen as a microaggression or cultural insensitivity, I don’t think it warrants escalation to school admins.

That said, I’m unsure how to respond. Should I provide the synopsis? If not, how do I politely decline? If I do, should I set any conditions (e.g., ensuring my statement is sent directly to the admins or remains anonymous)?

I’d appreciate any advice—this is a new situation for me. Thanks!