no, though she would be able to stop the govenment doing it, though she could concievably declare war on new england
all laws have to be passed by parliment AND signed by the queen.
some issues like decaring war are subject to the royal perogative, this is normal exercised bt the prime minister on her behalf, though i cant see that should coudnt do it her self if she had a real down on the patriots
durring the recent britex debacle, we had numerous court cases concerning the age old question of who was in charge, parliament, elected by the people or the govenment appointed by the queen and exercising the royal perogative, it seemed to be a draw