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Sounds like she was just trying to help you out.
Could you be more neurotic OP?
You’re saying that, not only did you cold-email a partner at a biglaw firm, but they responded and offered to set up a phone call? Consider yourself in the .01 percent.
An extremely busy human responded to an email they did not have to and offered to help you, the sender of said email, even though said help will bring no tangible benefit. That’s what happened to you.