She said yes to a date but does that mean she likes me?

I went to a trip with our school 2 weeks before and i actually never saw this girl before there,so when we sat in the buses she sat in front of me and it was love at first sight (for me) During this 1 week trip she wanted me to sit next to her (her friend wanted to sit next to the window,not sure if it is this or because she wanted me to be next to her) sooo after the whole trip i managed to ask her out for a coffee/lunch,she accepted and i gave her my number so she can call me (through facebook) On facebook she didn't like my profile pic but two others i uploaded (i was not on them) maybe because she is shy and doesnt want to show it,but thats the point she isnt actually shy,now im watching her profile pics and she has over 500 likes on each,so does she play with me or is she really into me? THANKS