Blackwell works at a convenience store in Chouteau, about 40 miles outside of Tusla, and said a suspicious woman came in that night around 10 p.m. and then left after buying gas, reports CBS affiliate KOTV.
Sammay got off work at 10:30 that night and walked out to her car, which was parked on the other side of the building, and got inside.
Blackwell drove a few miles and says the woman suddenly rammed her van into the back of Blackwell's truck.
"She hit me again, causing my vehicle to flip two and a half times, landing on the driver's side, and I just laid there playing dead," she said, reports the station.
Police chased the woman, Shireen Nalley, for a while and finally arrested her for assault and battery with a deadly weapon. Nalley told police she was "trying to save the children."
"She said that I was trying to hurt babies, I was killing babies and she was going to stop it before it happened again," Blackwell recalled. "She could have taken me away from my family, my daughter."
Blackwell's daughter is also named Caylee -- the only thing Sammay said she has in common with Casey Anthony, according to the station.
Nalley is in the Mayes County Jail on complaints of assault and battery with a deadly weapon, leaving the scene of a vehicle collision, resisting arrest and reckless driving. She is being held on a $25,000 bond.
Police say Nalley seemed to be on drugs when they arrested her.