It's always hard to determine right and wrong in these stories since there's always so little to go on, but I don't actually think there is any clear evidence the hospital was clearly in the wrong, and unfortunately the patient put herself at risk for how the hospital and police responded.
There are studies that show "difficult" patients and patients with "difficult" family members are far more likely to be the victim of failure to rescue, which appears to be what happened here. It's pretty clear that she was a "high utilizer patient", or what's commonly called a frequent flier. Some frequent fliers have legitimate chronic health problems and get unfairly lumped in with those who are not using system appropriately, but for many others getting escorted out by police is totally appropriate.
From the coverage: Woman refuses to leave hospital despite being discharged, dies shortly after being forced out | Fox 59
"WTXL said incident reports showed police were called by hospital staff multiple times since 2006 in reference to alleged disturbances involving Dawson."
That's pretty impressive even as difficult patients go, if they really mean to say "police" and not just hospital security. For patients without that established history at that facility, suddenly collapsing would be assumed to be a sudden change in medical condition. From the description, she had unfortunately created a situation where collapsing and not responding while being removed by the facility by police wouldn't be all that surprising and likely considered a behavior rather than medical issue.