Well I'm going to try to shift the topic and NOT talk about a certain girl's backstory. Let's look at another character.
There's something about Amy
She's the one who rumbled us onto Steven, displays knowledge of how the company operates, and is also revealed to be someone known to Clara and Linda by name. So an employee of the company who's been working there for a while then.
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Yet she shows up later at the pool claiming to Lisa that she's only in town on vacation visiting grandma - clearly a lie. Her bio, meanwhile, says she's a college student.
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Her meeting with Rachel at the club was no accident methinks. She's an insider in the company and is apparently also now trying to weasel her way into the family by trying to lure Lisa into a lesbian relationship via Rachel.
So who is she? An agent working for powers yet to be revealed. Someone working for Linda's boss? An undercover cop?
I'm thinking that's she's possibly the sister of the friend who fell off a cliff. Now grown up, she's trying to find out how her brother really died. Dun dun dun....