So picking up random girls in clubs/street/online dating is one thing, but how do you adjust your game for a girl that's part of your social circle and you're seeing her regularly? How do you isolate her without making her feel weird, since every time you see each other, there are friends you have in common around?

In my specific case, the girl has already given me a lot of IOIs so it should be easier. But I'd like to keep the question generic anyway, for pick-up theory's sake.