Here's the situation:
I met this girl a month ago in my town. We spent like 2h together and she definitely was attracted to me. But then on the next day I was leaving for 2 months for the university in other country. But she wrote to me on facebook and I was enjoying talking to her so I decided to try to keep her interest as long as I could - after all I'm just practicing the game.
Recently she was beginning to put me in friend zone, so I started talking to her about stuff like we're running away from our schools and spend the rest of our lifes together in Africa

. That was fun and she was responding well, and qualifying herself to me. But then we also had a roleplay like we're married and she's been talking to some other guy, and I guess I was playing a jealous husband way too long and came off as really jealous (yes I know that wasn't the best idea

)
So it partially worked. Now she texts me often (usually she initiates). And sometimes she tells me stuff like she thinks of me or that she can't wait till I come back.
But she's also constantly trying to make me jealous by telling me stories about what she was doing with her male friends etc. (...I've been doing that to her too but not in such an obvious way).
And she's now acting too confident!
And just now she texted me:
SHE: "(blah blah blah) what are you doing?"
I gave her 3 options and made her guess and then said it's her turn, then she gave me her 3 options and I said:
ME: "Hey you've just copied that game from me! Try to be more inventive!"
(usually she answers in ~3 mins, but this time she answered right away)
SHE: "You've discouraged me. I'm going to sleep. Good night!"
We both sometimes jokingly take offence so I said:
ME: "Hey, have you taken offence? : )"
...and got no answer
What do I do next? Could that have really insulted her? Or is she just waiting for me to text her tomorrow, cause she wants to prove to herself that i'm interested (in which case I guess I shouldn't text her, right?)
And what do you think I should do in general to lower her confidence and make her chase me again?
My ideas: Should I freeze out? Should I add some pics with another girl on facebook? Or should I carry on, and when she tries to make me jealous - say jokingly stuff like she totally should start dating that guy etc?
And I know there are plenty of fish... But let's say I don't wanna move on unless there's really no way out. There's just 1 month left.
This is my first post so sorry if it was too long and too detailed.