"Her future was robbed from her by a senseless act of violence. It's not fair," Whitmer told mourners at Zion Hope Missionary Baptist Church in Detroit.
Rema Vassar, chair of Michigan State's governing board, referred to the morning winter weather.
"Michigan doesn't get many sunny days, but the sun came out today. ... You know diamonds are forever. And she lives forever," Vassar said.
Anderson, she added, is "forever a Spartan."
Slain Michigan State University student Arielle Anderson's funeral was held Tuesday. Anderson and two others died when a gunman opened fire at her school last week. (AP Photo/Paul Sancya)
The funeral was the last for the three students who were killed Feb. 13 when a gunman fired at Berkey Hall and at the MSU Union. Services were held Saturday for Brian Fraser, 20, who, like Anderson, graduated from a Grosse Pointe high school, and Alexandria Verner, 20, of Clawson.
Anderson wanted to graduate from college as soon as possible on her way to becoming a surgeon, her family said last week.
Five students who were wounded remain in a Lansing hospital, including two in critical condition.
The shooter, Anthony McRae, 43, of Lansing, killed himself when confronted by police about 4 miles from campus. He had no connection to the victims or the university and may have had mental health problems, investigators said, citing a note in his possession.
Classes resumed Monday at Michigan State in East Lansing, about 90 miles northwest of Detroit.