Does this mean she likes me?

Today when I walked into class I was very depressed. I sat in my chair and did not speak. My friend, who I have liked for a long time walks into class and sees me. She asks if I'm okay, and I said yes. She then proceeds to give me a hug (that is the first time she has ever done that). Later in class my teacher told us to watch a video on our phones, and my friend (before I can say anything) asks if I want to watch it on her phone, and we shared a pair of earphones. I am particularly confused because she knows I like her. Because of that I am confused as to whether she is trying to hint that she likes me back. If she knows that I like her, why would she give me ambiguous signals I could take wrong? Thank you for helping.