Why does the girl I am dating keep using the 😬 emoticon for?

I started dating this girl recently, she puts 😬 at the end of happy messages. I thought that emoticon means you can't stand someone or am I wrong? I wrote her this morning about our date tomorrow. She just sent me a message back, "Yeah, I can't wait to see you again tomorrow! 😬 I thought to myself so why did she put an eek! face for then.