I don't remember much else from the episode, except the team find a seemingly human woman on some mission - and when examining her on Atlantis they discover her body is "perfect" in a cellular way - absolutely no minor imperceptible scarring or damage that all human beings have from simply the gentle wear & tear of normal life - no evidence of any skinned knees or anything - so that fact clues them into the fact that she wasn't actually human, but was an fabricated avatar or being made to communicate with humans - I think..

Any clue as to what episode I'm talking about? - I know it was Atlantis - I think an earlier season, but not sure - I'm trying find that specific scene for a presentation.

Thank you in advance for any help you can provide.