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yet she had to take care of her totally wasted friend and we simply went back to our homes.
I don't get this. You said "yeah sure" and yet did nothing in that regard. Just take them both in a cab, drop the wasted friend at her house and voila. You're alone with your girl.
Your mistake was being passive when it was time to be pro-active. I get that she did most of the work, since she even initiated the first make-out. That makes your job hella lot easier, but you still have a job. So when it's time to lead, lead.
How long is she staying abroad? Talk to her every 3-4 days. Sparingly. A few light-fun back and forths. When she gets back, get her on a nighttime date. Can be drinks, since she's already physically comfortable with your touch. Then get her over for netflix and chill.
Don't just wait for things to happen this time around.