Eight years ago, the president of Sweet Briar College abruptly announced that the more-than-century-old school would shut down. Horrified alumnae rushed in to save the small private women’s college in Virginia — and they did. Now, after a national search, one of those women, Mary Pope Maybank Hutson, will be the school’s 14th president, college leaders announced Thursday. She’ll be the first alumna in the role.