Good lord, why does she stare like that?

Maybe she's like this with all girls and is just a playa, or she could have feelings for you? If you're confident enough, ask her how she feels about you. If not, just wait for her to ask you, when she does ask make sure you answer truthfully! If she doesn't feel the same about you, you can just move on and then the friendship will go back to normal! YAY.