Niamh Winright's worst nightmare starts with a loud sensation. Then there was a sound of broken glass and a harsh echo of gunfire. In reality. She was arrested in a school shooting.

On the morning of October 24, 2022, panic swept the joint campus of Central Visual and Performing Arts High School and the School of Medicine and Biological Sciences in St. Louis, Missouri. 911 calls began to flood The gunman enters the building.

One caller told the dispatcher: “I saw a gentleman shooting in front of the door and then go in.”

"I don't want to die. Please. Please." said a student on another crazy 911 call.

Winright suffers from autoimmune rheumatoid arthritis and uses sugar cane, and suddenly finds himself huddling into the corner with his classmates. For safety reasons, she was knocked down during the fight.

"Some people are like crowded around me, sitting on me," Wainwright said.

In that moment, Wainwright recalls that she was never troubled by disability. When police arrived, they drove students out of the building - every student except Winright.

"Everyone ran out in class," she said. "It's really messy."

She was the last person to exit the room. In the corridor, things escalate again.

"I walked out of the room and the police trained me because I didn't put my hands in the air - because I needed a cane to walk," she said. "I felt that it caused me more trauma than some of the other students."

Two people were killed and several others were injured in the shooting. Winright survived, but her experience raises serious questions about the needs of public schools in life-threatening emergencies.

More than 7.5 million U.S. public school students live, according to data from the federal Department of Education. CBS News Analysis found that nearly 6.3 million of them live in states where schools do not require schools to develop specific emergency plans for students with disabilities.

Kira Tiller, who now attends University of North Carolina, is always worried about her youth. Her seizure may have been triggered by a flashing light from a fire alarm. Not only did she worry about real-world emergencies, she even did fire training at Northern Virginia high school.

"I know there may be an alarm at any moment, and I don't know what will happen," she said.

Tiller pushed for six years of accommodation, but it wasn't until her junior year that her school planned to provide her with blackened glasses and escort her outside the building during the evacuation.

The struggle prompted her to become an advocate. She had a conversation with other students with disabilities and realized she wasn’t the only one affected by emergency plans.

“It really makes me feel that students with disabilities are safe is an afterthought,” she said.

Tiller created an advocacy group called "People with Disabilities" which includes students with disabilities and their allies. She also brought the problem to Virginia Representative Laura Jane Cohen.

"The idea that it hasn't existed is shocking," said Cohen, a former educator and a parent of autistic children.

Cohen sponsors a Virginia law that requires public schools to conduct discussions and develop personalized safety plans for emergency situations and evacuations for every student with disabilities. Discussions need to include program coordinators, students and parents.

The bill was passed by bipartisan support and was signed into law by Virginia Governor Glenn Youngkin.

"You will never want students in this building where there are no adults looking for my vulnerability," Cohen said.

The law came into effect July 1, so as Virginia schools prepare lesson plans this fall, they will also develop emergency plans for all students with disabilities.