The First Amendment does not require Federal, state, and local governments to do business with organizations that boycott Israel any more than it requires them to support the Ku Klux Klan.
The people of Hong Kong seem to know far more about this than many Americans, Britons, Australians, and New Zealanders.
The same goes for other big cities that are governed almost universally by the extreme left wing of the Democratic Party.
What motive would others have to use a teenage girl to support their agenda? The usual motive is money, and a lot of it.