By Tzvi Machlin The college career of former Vanderbilt soccer and football player Sarah Fuller may be over, but it appears she intends to start being an advocate for future athletes. Taking to Twitter on Tuesday, Fuller called for a great effort put into helping student-athletes with mental health. She spoke out against the “continual pressure to be ‘mentally tough’ year after year” and believes more can be done. “Something has to be done to better understand and aid in student athlete’s mental well-being. What’s being done now is not enough and the continual pressure to be “mentally tough” y…