Spend more time with her as another use said and see how she acts around you. You should be able to tell if shes feelin you or not. Clearly it's easier said than done. Just spend some time with her and send it to her via text if you need to. Before people blast me about the texting part, you may not want to put her in an awkward situation irl, especially not with her right there in front of you. It could really mess things up, but you need to be honest with her rather than hiding it away.