there is no need to tell somebody her age! Might be that she isn't full aged, maybe e-webz isn't aswell. If so, there is nothing wrong with her possibly young age!
but e-webz you should now that might be a bad tactic to publish photos of someone else without his/her knowlegde and agreement, i hope she is ok with you step to make her photo public
East Asians like Koreans, Japanese, Chinese looks are difficult to guess their ages. This girl may not be as young as you guys thought. She could well be over 17 or even 18.