Don't hate on me, but can there be a case made for something else? He'd been sick, she intended to bring him to urgent care, he may have vomited and asphyxiated while she was driving, she panics feeling like she's going to be blamed, and thus a very bad idea is born?
Do urgent cares have survellience? Could she have sat in a parking lot, not doing what to do? And then decided, at all cost, she didn't want to be blamed?
It's a stretch.... but that's what we're here for, right, ideas?
Just trying to see if there are other ways to look at this.
JMOJMOJMO