Need girl advice on this girl I like?

[Wow]

I'm a junior in highschool and last year at my old highschool in my 1st period class I sat infront of a girl and we would talk/flirt for an hour everyday for the whole year. I was seeing lots of girls and doing lots of drugs and never gave it any thought how lonely this girl was, and how much we had in common and how attached we became. I go to a new school tho! Yesterday I looked for her on all social media, and she isn't there. How am I suppose to meet her again and maybe this time hint that I'm interested? Because I don't have a car, and I think ditching school just to walk two miles to her school and wait outside till she walks out is creepy as it gets lol I really want this girl tho, I've been craving a serious relationship and I can totally see it happening with this girl

[postal p]

Try to get her number from a mutual friend.