>A pretty dick move on her part for wanting to be included in a complete strangers personal circle?
No, a pretty dick move to piss on her for asking to reconnect with an old schoolmate with a rude response.
FB is not some "personal circle". People connect to wide circles of accountancies they barely meet once in a decade and old schoolmates from way beyond and such all the time. And if one doesn't, it's still perfectly fine, given the widespread practice, for others to assume that it's ok for them to ask.
No other motive needed other than we're all humans, and we tend to think of people that passed through our lives in some way or another, and might want to occasionally catch up and/or share some old-time story.
No further need to "question the motive" (as if she's some huge scammer) than to question "high school reunions".
In the end, one could just ignore the request, or reply politely ("Sorry, I only add close friends and relatives on FB").
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