"It's normal for a parent to bring their kid to work if they can't find a babysitter, but Mina Barret doesn't exactly work an office job--she's a CIA field agent.
She's also a vampire. The Dominion isn't going to take a break because of Mina's schedule, so when an urgent situation crops up in Libya right before she learns the bad guys have plans to abduct her daughter, there's only one possible fix: bring her daughter on the mission."