In terms on looking at SMTP headers etc, you're quite safe. All they can find out is is that mail originated from yahoo.
Yahoo may have details about your actual location as they may have IP address logs to show where you logged in from. There's no way however they'd share that with anyone except a law enforcement agency (I hope she doesn't work for the FBI!)
The only thing I can think that can give you away your identity would be the email address or the content of the email itself.
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