Ambiguous Peripheral Greetings

I crossed paths with a neighbor of mine earlier this week, and as we were passing each other, I asked how she was doing. She replied, "Pretty good." And as we continued on our respective ways I said, "Good." I meant good as in, it's good that you're good, but I realized that it probably sounded like I thought she asked how I was doing back, which she did not, and I answered, "good." The ambiguity really annoyed me.