Dawn calmly explains to Joe that she was certain that the criminals wouldn't kill him and leave them with no way to get at the money; Dawn had planned all along to still share the money with Joe as they'd originally arranged, and so she had merely taken the money in order to keep it from anyone who'd pursued Joe.
Dawn calmly explains to Joe that she was confident the criminals wouldn't kill him, leaving them without a way to get at the money; Dawn had planned all along to still share the money with Joe as they originally agreed, so she took the money to keep it from anyone pursuing Joe.