Girl's Behavior

I'm confused if she has any attraction towards me?

I'm currently friends with this girl who attends the same grad school as me. We've known each other for about 6 months now as we've worked on a few group projects together. When I text her, she does reply to all of my texts although she sometimes takes like 3-4 hours to get back to me. She also uses lots of various kinds of emoji in her texts. But she may have only initiated texts like 4 times till now and all of them were about school related work.

Now, our classes have different schedules, so I only see her sometimes when I walk to the school. Whenever we have conversations, our eyes are locked with each other and she smiles and laughs at my every statement. Moreover, when we were walking, our shoulders and arms were brushing each other and she didn't pull away even once. Once I even caught her giggling while reading my text when I approached her from behind. She acted surprised and flustered and told me that I scared her.

So, looking at all these clues, I texted her to go with me somewhere on the weekend. She, however, left my text on read and replied to my other text that was not related to the invite.

I'm not sure what I should do in this situation?
I'm confused if she has any attraction towards me?
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