Yeah just take it as a normal date.
As for kino escalation a lot of people say vin de carlos kino escalation ladder is awesome.
Personally, I would just hug her when you see her (then laugh and say "now get the fuck off me
") for a little bit of push pull.
High fiver her for something stupid later:
"Are you spanish?" "no"-hi5-thank god i cant stand spanish ppl
"yes"-hi5-thank god i love spanish ppl lol
Also travel with her to build up comfort. You could say "come with me! I have to show you what I saw in Walmart (or whatever is near)!" Then offer out your hand for her to take. Then you guys are holding hands (PRESUMABLY). After that take her outside, and since its cold you could hug her and hold her close to warm her up. Then you could say something random (blame her for being sexy "You would be fucking sexy today"), then interrupt yourself by saying "I can tell you're no longer listening to me. Here, let's get this out of the way" *Mwah*
If she does say at anytime when you are doing anything that she does have a boyfriend, I would just say "so do you want to cheat on him with me or what?" Girls love a guy that doesn't care. However if she says no. Then you just have to roll with it and say "ok." You want to be honest with your intentions. This is basically you taking that last chance. That last shot.