DWI stands for Driving While Intoxicated, not Driving While Impaired. The restriction in the law is against "intoxicating liquor, cannabis, or any drug".
A heart attack is not liquor, cannabis or a drug, therefore, it is not reasonable to charge this woman with a DWI.
As someone who did, I understand the sentiment but it isn't that easy. I have so many friends and family members who are stuck there because they can't save enough resources to leave.