[KT9]

I think simply replying with "No, I am is real mom" would suffice and get the message across. I don't know the context in which this woman said that, but a lot of the times, I've found, people will make comments about adoption without realizing they are being rude. Maybe this woman has never known an adoptive mom before and doesn't know the "correct" things to say. Don't let those little comments upset you. Just calmly correct the person and move on.