@lizzmitch, that’s a real doozy! After all, heaven is supposed to be the big “carrot” for believing in your religion—and your kid thinks it’s a “stick!” How ironic.
What I’d suggest is to be honest with her about what the Bible says about heaven. In the Bible, it isn’t a magical place that all the good Christians go to when they die. The Hebrew word for heaven, “shamayam,” actually just means “sky.” It’s a solid dome (the “raqiya”) that God created to hold up the ocean above the sky. He also set the sun, moon, planets and stars in this solid structure. See Genesis 1. (Bet your daughter didn’t know that the sky is solid and holds up an ocean! Or that the sun revolves around the earth!)
Also, the Bible never says that you get to go to heaven when you die. Rather, in the End Times, your corpse will get resurrected by Jesus when he brings the Kingdom of Heaven down to earth! See the book of Revelation.
So perhaps you should try telling your daughter that she won’t actually have to move up to heaven. Instead, after Jesus comes back and kills all of the unbelievers, Jesus will use his magic powers to bring her rotting corpse back to life! And maybe, she can even bury her toys and stuff so she’ll have them at hand when she resurrects!
If that doesn’t work, though, you can always just threaten her. Say that being resurrected into the kingdom of heaven is better than the alternative—“wailing and gnashing her teeth” in the “lake of fire.” Or go Old Testament. Tell her, per Deuteronomy 28, that if she doesn’t obey God, God will strike her with blindness, boils, and starvation, sell her into slavery, force her to eat the flesh of her own children and the afterbirth of her miscarriages, and “take delight in her ruin and destruction.”
Better yet, you could try not brainwashing your children into this bizarre cult.