Can you send someone a message on Facebook without sending a friend request or adding them as a friend?

I have a classmates phone number and I have been trying to get a hold of her, but she never answers, leading me to leave messages. I know she works and is currently taking summer classes, but I don't know what else to do since she doesn't check her gmail from the school website. Can I still send her a... show more I have a classmates phone number and I have been trying to get a hold of her, but she never answers, leading me to leave messages. I know she works and is currently taking summer classes, but I don't know what else to do since she doesn't check her gmail from the school website. Can I still send her a message without sending a friend request or no? I noticed she doesn't have an add friend button on her Facebook page anyways.
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