No she wasn’t. and even if she was, she was going to a ball game, in her own country. NOT in a foreign land, where as the daughter of a President of the US, there is protocol. Even if her mother does not adhere to it, it still exists.
And I too wish that the president's family would always dress in their Sunday's best while in public on foreign trips, but I still do not think that that justifies the broad "ghetto" insults, especially when a grade school kid is involved.