[teenyelliott]

1) She has expressed in writing her desire to be starved to death if incapacitated

There is nothing in writing. In the absence of a written directive, it falls to the physician and family to determine the right thing to do for each individual patient.

2) That there's any legal or moral grounds for doing so even if she has written this.

Florida state law, and concurring federal law, including Supreme Court opinion.

[Jim W N]

There is nothing in writing. In the absence of a written directive, it falls to the physician and family to determine the right thing to do for each individual patient.

Again, protected custody to save her life if there's doubt and possible suspicious motives involved, which is the case here.