Nice analogy but you did not answer my questions. You analogy fails as there are statutes against advocating murder. The statutes involve one person urging a second person to kill a third. That was not this situation.
This is conspiracy and incitement to homicide, in this case, suicide. This is not the same as yelling to a suicidal person to jump from the ledge, as disgusting as this is, this is like putting the person on the ledge and ordering them to jump.
It will not be hard for the prosecutors to show that the boyfriend was mentally impaired and that she had undue influence on his behavior. Because of that, her ordering him back into the cab of the truck is an action that facilitated his death and she is culpable.
If you don’t think that is a crime, then what would you think of a parent who calls for their toddler to run to them across a road with heavy traffic?
“Why, my child just ran into the road. Sure I called to him to come, but I didn’t force him into the path of oncoming cars. Calling to my child and him crossing the road aren’t crimes, so how can I be held responsible?”
It’s negligence and why she is being charged with manslaughter.