Should I try to get a hold of her?

I hung out with a few girls the other day, two of which were my friends and the other I was just meeting. We went to this place close to town that's suppossedly haunted and there's always people driving through it just to check it out. On the way there we all were just talkin and havin a good time. When we got there we drove through a few times then eventually got out and talked to another group of kids that were out there with flashlights walkin around. They told us they were gonna go walk around some more and we could come along if we wanted too. The girl I just met wanted to walk around really bad and the other two just wanted to stay by the car. So she came up smiling to me, grabbed my arm and asked me to walk with her. We talked a little while trailing a bit from the kids in front of us and the whole time she was squeezing my arm hard enough that I made a joke about her cutting of my circulation lol. Nothin scary happened while we were there but she still held onto me and was giggling so I slid my hand down her arm to hold her hand and she went along with it. Later she asked me to run back to the car with her and so we did. On the way home she was really quiet, which was the opposite of how she was on the way there. One of her friends asked her if she was still alive and she mumbled something. Then I asked her if she was tired and she shook her head no. At this point i was confused as why she was being so quiet. We all went home and the next day I ended up adding her on facebook. Sorry about the long story but I just wanted to know if I should try to contact this girl or not or just move on