Is this girl interested in me?

So, I've been taking extra lessons outside of school for some time. I came across that girl one day when I was sitting infront of her and she gave me a box of cake and asked me to throw it in the trashcan. She thanked me and a few moments later her paper fell on the ground so I picked it up. After the lesson I asked her where did she get the box from as it was strange that someone would bring gateau to such lesson. We just laughed it off. A few days ago she sent me a friend request on facebook and she likes all my posts. Even tho I am not so popular on Facebook, I get like a like or two. And I just reacted ❤ to her profile pic. The next day she reacted ❤ to mine.
Is this girl interested in me?
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