Nice girls usually try and be polite...this can be viewed as encouragement. One more go and then back off. There will be someone out there who thinks you are the bees knees.
But perhaps, one more go, then see what she says. If she sounds apologetic and says she's busy, then I could perhaps wait until she has finished uni, as she might be genuinely too busy to meet up, and after all, even last time she did say it would be lovely to meet up. If she still says no, then it'd be clear that she's not interested.... Does that sound reasonable? (though I wish if she wasn't interested, she'd say it, but in a nice way, as surely she can tell I'm interested in her....)
