She had just gotten her first paycheck at a Studio Movie Grill in northwest Harris County and walked straight to the ATM on her way home.
"I felt like someone was following me, so I kind of went to the other side of the road," she said.
She kept walking until she heard a man yell at her from behind.
"He said, 'Shut up and give me everything (expletive),'" Williams said.
Williams spotted a driver in a car nearby and ran to him, screaming for help. But that driver wasn't there to help her.
"I thought it was a regular person but it was his getaway driver. And he told him to hurry up and finish, like, what he was doing. He got the purse, got in the car, the car had moved up, and he shot me and drove off," Williams said.
Someone in the apartment complex heard Williams screaming and called 9-1-1. Her dad, Michael Williams, was working as an emergency dispatcher at the time.
"My wife called me crying, saying Amanda had been shot," he said.
One of the ambulances in Williams' fleet ended up taking his daughter to Memorial Hermann Hospital.
"He was aiming to kill, and it almost hit my heart," the 16-year-old said.
She has a broken collarbone and a broken rib. She should get better physically. Emotionally, though, she has more healing to do.
"My anxiety is a lot worse. Also I cry during the day and I don't know why," she said.
A sketch artist with the Harris County Sheriff's Office drew this picture of the suspect, based on Amanda's description.
"On his teeth, at the bottom, every other tooth was gold and then the top three were gold," she said.
If you recognize the suspect in the sketch, call Crime Stoppers at 713-222-TIPS.