That, or we could have promised to keep her secret, and help her build a life (until she was caught and we 'buy' her to protect her... )...That would've been quite the plot twist if she turned out to be half-elf... And if iirc, half-elves have like no rights whatsoever, so we could've pretty much just turned her into a sex slave without her permission.
Though the elves do some some rights, in that you can't rape one, but if she was a half-elf, then blackmail or something could have been an option.