That being said though, I do think you're probably correct in that the hospital did likely assume something about Lisa and did not take her concerns seriously.

I'm curious what her treatment even was considering how recently she had had a stroke and how she clearly picked up on some warning signs about having another one.

Hospitals are often tasked with doing a lot, oftentimes more then they really should be responsible for, but patient care should always be the #1 priority. Its just unfortunate when you have incidents similar to these, where (putting aside the loss of life) even if the assumption is correct and the hospital is dealing with a repeat visitor or somebody struggling with mental illness, that patient care seems to take a backseat to profit and getting the "patient" back out the door "treated"