The emergency room has ludicrously high costs, and none of his medical history. You're literally saying "don't expect to be able to see your primary care provider, go to the emergency room instead" -because of existing debt-.
You're making a lot of assumptions...all of which miss the point. Why is life shattering medical debt a common thing we tolerate in this country, given every other Western country has managed to make it a rarity? But, to your assumptions - maybe and she gave birth prematurely and ended up being seen by a hospital who were out of network and her insurance didn't cover it. Or even went to an in-network hospital, but was seen by doctors who were out of network, as frequently can happen, especially in emergencies when you can't personally vet the doctor is in network for you before you see them. Certainly, something unexpected happened (maybe even the pregnancy itself! Something to look forward to with the Supreme Court set to overturn Roe v Wade), and insurance wasn't there. Why is that acceptable in this country?