Is it okay to send my classmate a message on Facebook and add her?

OMG, I just sent a message to my classmate on Facebook!

We don’t usually talk, we only talked once about the coming exam briefly when I was at Starbucks across the street from college for a cup of coffee and she was working there.
Now, I was thinking about adding her on Facebook coz i kinda like her. But then I figured out it’s better to send her a message. So I sent her the following:

Hey, whats up my classmate?
If there was “Add as Classmate” instead of “Add as Friend” I would’ve added you.. lol

How you doing?
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Is that too much?