Is this a relationship?

Time. It may be still too early for her to develop feelings for you, and you don't want to rush things and put pressure on her to be in a relationship. It's always a nervous situation I understand, catching feelings for someone and not being sure if they feel the same way. The best thing to do is just to wait it out for a while, see if she mirrors your behavior and see if you can pick up that she is interested in being more than just friends. If your feelings for her start to grow and she still isn't showing anything, then just put it on the line. If she wants a relationship, great! If she isn't ready, alright - no problem still being friends, right? Best of luck to you, friend! :)

Just ask her. Right now you're just friends with benefits in my personal opinion, so if you want to clarify things, just ask her. There is not an easier way sorry :/ . But if she says no, you guys can still be friends