The answer is probably not. Assuming your parents' marriage lasted at least 10 years (which is necessary to qualify for survivors benefits), the only way she would be entitled to benefits based on your father’s work record would be if (a) she was over 60 when she remarried, (b) she became disabled before age 60, or (c) she divorced her new husband or he passed away.
For more on how divorce and remarriage affect Social Security benefits, read this article.
For more articles on Social Security benefits, check out this series of articles.