I’m not buying it either. Most six year olds can’t tie knots by themselves, and need help fastening their belts. Not to mention needing help tying the laces on their shoes.
Also, most normal six year olds wouldn’t climb into a baby crib willingly. They usually transition to sleeping in a bed before that age. And if a six year old was using a crib as a hiding place, they would most likely hide under the crib, not inside it.
No, I suspect what happened is the poor girl was sent to the crib as punishment. Someone must have tied her inside the crib with a belt around the neck to keep her inside the crib... and as she tried to escape the crib, she accidentally hung herself. This is not likely a suicide. Samantha Kuberski, six years old, was murdered accidentally, either by her parents or perhaps one of her siblings. This is definitely a murder case.
Could it be someone smothered her with a pillow, THEN hanged her there?