2. Dissolve Parliament
If she chooses, Queen Elizabeth could fire everyone in the House of Commons and hold a new election of entirely new members.
Though, Her Majesty has never used this power. But, even if she did, it wouldn’t disrupt government activities as much as you think.
The Government itself, including the Prime Minister and Cabinet, would be unaffected. The last time a monarch dissolved Parliament was in 1830. And, a decision to do so today would most likely be hugely unpopular with the public.