In the Class of 2016, 97.7% of students received their high school diplomas on time or earlier.
Shook says she had complained about the suspect at least twice before to school officials, including a vice principal.
The sheriff's office said that just before 8:00 a.m., an active shooter was reported at Italy High School in Italy, Texas.
Sgt. Joe Fitzgerald of the Ellis County Sheriff's Office told the Associated Press that he did not know how many students were in the cafeteria at Italy High School when the shooting happened at about 7:50 a.m.
According to the Texas Tribune, Italy High School has students in 6th through 12th grades. Her condition hasn't been released. He also informed the community that counselors will be provided on campus to speak with students.
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Sheriff's officials say there's been a shooting at a high school in a small town south of Dallas and a suspect is in custody.
Italy has a population of about 2,000 people and calls itself "the biggest little town in Texas", Dallas Morning News reported.
The Ellis County Sheriff's Office tweeted, "The kids are being moved, under guard to the dome as the investigation continues".
A text message from the school district's superintendent to parents indicated one person was wounded during the shooting, who was rushed to a hospital, according to ABC affiliate WFAA.
No injuries have been confirmed in the shooting.