"this girl had me pegged from the first second she met me. She KNEW that I was an adult who "like-liked" LG's. How the hell she knew it so quickly, I will never know."

Ha! Really?? How young are you, again?? I'm surprised you've only met one of us.
It's called pedo-vision. It's like gaydar, but for pedophiles. It's a gift. A select few children have it. I was one of them. I could pick you men out of a crowd before anyone noticed my presence. From your description of the girl, our similarities start and end with pedo-vision, though.
If you don't know what you're doing, then I can't explain it. You men give off some kind of signal, intentionally or not, that some children can detect from a mile away.

My theory is that children with early childhood exposure to threatening or scary pedophilic situations develop this extra sensory perception(?), as a survival mechanism. What we do with this gift widely varies.
I suspect this girl was badly molested, long before you arrived on the scene. ALL of the behaviors you describe, taken together, are consistent with early childhood sexual abuse. THAT, rather than "*path". I don't think she had the required dark triad; I don't think she fully understood what she was doing or why. Nevertheless, you were right to be careful around her. Thankfully, you didn't re-victimize her (assuming my suspicions are correct).