Am I overreacting/overthinking friendship.

We have been friends for about a year and a half. I have hung out with her and her husband. She and I were hanging out, she mentioned that her husband was out of town. I asked where he went. She said he went to see his mom, I then asked if his mom was okay, and then she said why are you being nosy? That’s me and my husband’s business. I don’t/didn’t think that I did anything wrong. I was caught off guard, we are friends and I wasn’t expecting this response. I was just asking a question to my friend. I’m confused, are we not friends? Was I wrong to ask a question. I’m sorry if this made no sense.