I made my crush cry. She's ignoring me now :(?

Anonymous
So recently, me and some friends decided to pull a small prank on another friend, but it turned out to be my crush. None of my friends know that I like her. The prank when on for a few miniutes, until she started crying. We all stop the prank and I was the first to apologize, since I started the joke. I feel really bad for starting the joke. We usually talk a lot online, but she wouldn't respond to any of my recent messages. I tried apologizing online, but she would just mark the message seen on facebook, and wouldn't reply. How can I apologize back to her correctly? And what should I do?
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+1 y
Edit: I was a small prank, like where you ignore someone, and you don't talk to them.
I made my crush cry. She's ignoring me now :(?
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