"Sometimes she tells me she's going to kill me," Bell began. "Truly ... sometimes it's with a gun."
"If I tell her like, 'Okay that's a wrap on the candy bar' or whatever, she'll go, 'Well, I'm gonna get a gun and kill you and I only like Daddy' and she'll just leave the room," she continued.
The "Frozen" star told the audience that although it "sounds scary," Bell joked that they don't need to worry because she and Shepard are "talking to people" about their daughter's, er, issues.
"I know it sounds really bad that my child threatens to kill me, but like, she doesn't have a gun so I feel like it's not a real threat," she added.
Colbert pointed out how he enjoys how children "challenge" parents. The late-night host then asked Bell if she ever gets into "deep discussions" with her kids. The actress replied that she and Shepard are sometimes tasked with answering life's philosophical questions. Along with Delta, the couple share daughter Lincoln, 5.
"Sometimes it comes so fast though," Bell said. "Like the other day in rapid succession I got, 'Is Santa Claus real?' 'Who made dogs?' and 'Why is Earth?'"
"Again, I'm like winging the parenting thing," she continued. "So I was like, 'Does anyone want to go in the pool?"
When Colbert asked Bell which of her two daughters asked about our planet, she said it was Lincoln.
"The three-year-old will get there," Colbert said. "If she doesn't kill you first."