Oh, good find! Apparently another vehicle was involved, but as you say, no one was hurt.
"Fulton County Sheriff Richard Giardino said a car scraped the side of the bus when it moved into the middle of the road. The other operator hit the bus and scraped the side of the bus,” Giardino said. “Nobody was hurt.”
Could this have been the incident, and she's just amplified it? The speed limit would fit what she's described.
The idea that she's collided with a school bus at speed, and has ended up with life-ending injuries yet the incident wasn't reported anywhere just seems a ridiculous stretch.