339L: Three Days Turns Into 30 Years

I’m having trouble locating a children’s book. Here’s everything I remember:
Picture Book
I first read it in the late 90s so definitely published before 2000
A girl ends up in heaven/utopia for 3 days and when she returns to her mom 30 years have actually passed. Her mom has aged significantly.
She might have been fleeing from a war.
That is all I remember and I am completely stumped. Hoping you can help since google was unable to.

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