That’s a 30% death rate...and she was fortunate... there were many families who had higher rates of death.
As for Dugggar’s your watching what it looks like to be under the sway of cult teachings...Why everything appears so scripted...and why their relationships are what they are.
Their life is a “Performance/Image based and Fear based” religion which is legalistic to the extreme....and because the indoctrination is so subtle, as with most cult’s going in, the family “beleives” what they’re practicing and saying even if their heart might tell them otherwise. The teachings “trap them” from critical thinking of their own.
Fortunately it’s not my job to make that assessment or place that label.