The underwhelmed expressions of the teenaged sisters sparked mainly amused comment, but Lauten's remarks were notably more caustic.
"Then again, your mother and father don't respect their positions very much, or the nation for that matter," Lauten wrote in her post.
"So I'm guessing you're coming up a little short in the 'good role model' department."
"Nevertheless, stretch yourself. Rise to the occasion. Act like being in the White House matters to you.
"Dress like you deserve respect, not a spot at a bar," she added, apparently referring to the girls' short skirts.
Lauten subsequently apologized on Facebook.
"I quickly judged the two young ladies in a way that I would never have wanted to be judged myself as a teenager," she said.
US media report relatively little about the private lives of the Obama girls, and personal attacks against a president's children are considered taboo.
-AP