so I know this girl from a few years back, she kinda dsliked me for the greater part of those years but for a few months now she likes me and we've had a thing, it was like a casual relationship. anyways this "thing" ended when she left and moved to another country. We text almost all the time on SPAM and we chat on facebook but a few hours ago she texted me on viber cause SPAM wasn't working and I tell her to call me instead and the only thing she said was no. She didn't even bother to write anything after it. All said was ok and then I changed the subject and it seemed that I didn't really care, like it was no big deal
Now I have two questions:
1) did I handle this right?
2) what do I do to make her say yes the next time?
and just so you all know I kinda have one-itis for her, I've loved her since I was 12 and she knows it and I was kinda beta at first but now I control the frame or I thought I did until this happened so any help would be appreciated

Thanks for your time