Confirmed - the girl is MAGGIE NIXON.
Last line of this article matches the line of the article in the printed pic in Q's post:
"The Obamas were announced in for the night at just after 5 p.m., and on Sunday morning the presidential vacation came to an end."
Article: Obamas End Their Summer Vacation
sauce: https:// vineyardgazette.com/news/2010/08/30/obamas-end-their-summer-vacation