They toss a coin

"Look, she's even drunker than us", Roxy ponders with apprehension. "And you know it's not even safe to ride with her when she's sober." - "You're probably right", Candy agrees. "So, what do we do?" - "Send her on her way and let's toss a coin!" - "Deal!"

Stepping over to Lizzy's pickup, Candy shrugs apologetically. "Sorry, sis", she grins, "but we're big girls ourselves. We don't need any babysitter to deliver us home, especially if she is drunk." - "Not approximately as drunk as you are", Lizzy snorts. "But as I said, do as you please. I'm out of here!" She guns the engine and speeds off while Candy rummages through her purse in search of a coin.