This is the town of Balin near Ramallah. Every week a demonstration is held there protesting the wall being built around the town. Usually with heavy presence of Israeli and western peace activists. And sadly, although the protests are usually peaceful, there are multiple cases of rubber shots wounds and suffocation of tear gas every week. The girl looks Palestinian to me, so she may have been raised in the US or have studied there. And even if she hadn't, there are many Palestinians who can speak with perfect English (with an accent that depends on the educational institution that they have attended)