I totally understand how awkward that felt. I am going through my Inquiry Period in the OCA right now, I can't take communion either. If the lady does it again (she is just trying to be nice), just let her know politely,"Oh, I'm not Orthodox yet, so I can't." and then thank her. That's probably the best thing. And, who knows, you may even make a friend who wants to help you on your journey. I noticed that, at the parish I'm attending, when I said that I was seeking to be Orthodox that many people came and were so helpful and are now talking to me about things. So, don't be embarrased to, very politely, let that lady know that you are a seeker and can't partake of the Eucharist yet. I'm sure she'll be understanding.