Wait 5 minutes, walk out,  don't pick up her calls until tomorrow when you'll tell her you had a emergency and had to leave, when she ask you tommarow what the emergency was tell her you had to give a friend (female) a last minute ride to work( across town) ,  ignore all contact with her for the next 5 days. On the 5th day (a Friday) send her a "wassup"  text at 7am, don't respond to text until 8pm or so,  when she ask where / how you been tell her "life's been crazy"  and you want to tell her all about it,  setup a date at your place or hers, get some $5 wine & take out food,  make up a bunch of sob stories ( work sucks,  fake aunt is sick,  got a flat tire etc etc )  shyt like that. Keep the wine flowing at some point give her a fake apology about being m.i.a for the last couple of days, tell her you been thinking about her a lot .  Throw some bullshyt movie on the TV. Drink more wine   fukk her.  Come back here tell us about it.