Is this really a threat?

WSFA News reported the arrest of a 14 year old girl in Boaz Alabama who allegedly threatened the President.

A north Alabama teenager is under arrest and it appears her homework assignment is what got her into trouble. Police say she wrote an essay, proposing that everyone in the country be allowed to kill two other people.

. . .To make matters worse, the girl also allegedly wrote that President Bush would be the first person she wanted to kill.

Now, I can see how this might be grounds for suspension and that the girl probably needs counseling, but to arrest her for making a threat against the President just because she suggested that she would like to kill him seems excessive. It also seems to violate her constitutional right to free speech. To be honest, I don't see how it really even constitutes a threat. To say that if there were a day when one could kill people without negative repercussion, I would kill persons A and B, just doesn't seem like a legitimate threat to me. Maybe it's just me. . .