That was brilliant, Pam! I have to confess, I was among the people who thought it was a Mary Sue. I didn't catch on until the end. In fact, I thought Lois was a time traveller (don't ask me why!

I dunno... her being self conscious and feeling out of place, and treating Clark differently from everyone else...) Anyways, I vote for the adjusting her glasses thing, just as a reminder to the reader that she's wearing them, cos by the time I'd got to that point in the story, I'd forgotten the description of Lyn given at the beginning.
I also loved the very first paragraph, where, by having Lyn mention casually that it's known that CK=S, you establish that we are in the Alt universe with amazing economy of words

In fact, the very first clue is right there in the fourth sentence: "Luckily for me, I know how to sneak inside."
Great job!
JM