Rosa, I hate to break it to you but I don't think it's possible. Maybe if you have a Twitter or Facebook you can message her if she has one anyway.
Is there a website where I can talk to JK Rowling free? I only want to wish her a happy birthday (we share a birthday)...
Umm you can do that with all her fans on Facebook , Twitter etc etc!Β
On facebook you may message her or post on her page's timeline , I haven't used twitter so I guess maybe something like that you do on that too!