Was she trying to get free advice? I'm not in Japan, but I know doctor aquaintances that I never directly ask advice from because I feel that would be awkward. Sometimes, in the course of a conversation something comes up, like I explained how I was sick and my ears get plugged up in airplanes, and he went into detail about how that happens, and what to do about it. But I would never intentionally ask something unless they were good friends. Because I'm not paying them, and it's their off time. It sounds like that may be a similar situation - I think it would be rude to ask a doctor a health question about yourself like that. But then, I don't know exactly what they were talking about or what their relationship was.