Are you slow? SHE IS 12 - she cannot decide to leave the country with a 30 year old. Next you will tell us she can consent to sex with him too?
What if she had left the country by herself? Assume for the moment that the guy doesn't exist. Are you saying that she couldn't travel with her own passport? Not all countries have laws requiring written parental permission for a minor to travel, ya know. Last I checked, England and France are not like Mexico.
Michael