You're drawing your own inferences from who knows where. Cardiac psychosis can be something that could (rarely) occur in late stage CHF patients. Those folks can barely move around at that point though.
This woman did aggravate her serious medical condition, though, and I'm willing to believe she didn't have a complete understanding of it.
I say this being in full agreement we need better healthcare in the US. But I've also seen people with access to great care who just didn't give a shit about the recommendations of their doctors. People are complicated.