<p>Peacemaker:</p>
<p>How strong are your D's math skills? What kind of math does she like best?  She might pursue a degree in statistics, pure math or applied math; economics is a math-heavy field which does not require as advanced math  as a math major.
If she loves to travel, I would suspect that people skills will be as important as the actual major. She could go into international business or the foreign service or just decide to work abroad in her chosen field.  But the capacity to be flexible and culturally sensitive is a personal attribute that is not part of a college major.</p>