Should i ditch my "friend"?

So I moved here to New Zealand (from America) 6 months ago and have just finished year 11, it’s summer vacation now. During the school year i never really made friends because i was still getting used to the culture here, how people are, and dealing with missing my friends and life in America. But on my first day there was this girl that was nice to me and even though she was a bit weird i thought i’d try and be her friend. I found out that we really had nothing in common and we wouldn’t talk about anything else other than schoolwork or else it got awkward. She’s really immature and it just wasn’t working so i tried slowly ditching her but then realized I had no one else I could sit with at lunch or talk to in some of my classes and I hated being lonely…So I just bared with her. I found out no one else really likes her either and she has no other friends, that made me sad even more cuz i wanted to ditch her. It’s been a while and she still thinks we’re ‘friends’ when i’ve just been kinda using her.
Now it’s gonna be a new year and I feel a bit stronger and have dealt with the fact that I wont see my American friends for a while. I wanna make new friends and kinda start over as i was mostly invisible last year which is definitely NOT how I am. I managed avoiding her for the whole summer, BUT she called me the other day and wants to hangout…I tried to say no but I’m still so lonely so i just said yes.

What should i do? Ditch her? ignore her completely now, and hope she’s not in any of my classes next year?