How can i tell if this girl is truly interested in me?

Ok so I think this girl may be interested in me, because we were at a party and we were throwing firecrackers in to a small fire. I was sitting watching and my friend started to walk toward the fire. I got up and followed him and this girl became hysterical as I walked toward the fire, but NOT as my friend was, and I was talking to her while still standing near the fire and a fire cracker went off and I acted as if I was severely hurt by falling to my knees and then falling to the ground. She was FREAKING OUT! So is that a decent sign that she likes me?