Authorities announced that an anonymous tip led them to 44-year-old Michelle Touissant.
Police say Touissant was driving on a suspended license at the time of the crash. The striking vehicle was also recovered.
It happened around 6:30 Saturday in the southbound lanes of Route 561 near Evesham Road.
The victims, identified as 28-year-old Cathy Calalang and her 20-year-old cousin Laurene, were struck while walking home.
Relatives of the victims spoke to Action News prior to hearing about the arrest.
Calalang's parents, Rolando and Jacqueline, who live nearby, just happened to drive up to the scene.
"We saw her lying down on the pavement and we panicked about it," Rolando said.
Joshua Llamas, Cathy's fiance, talked to Action News Monday afternoon: "They were both walking and then out of nowhere they got hit by a car," he said.
A cousin of both victims, Janelle Halili, lives just feet from the hit-and-run accident scene and had a message for the driver.
"It's two ladies. You could've at least stopped or helped instead of running away," Halili said.
The two women, both in their 20s, were transported to Cooper University Hospital.
Calalang lost her front teeth and suffered several broken bones and bruises. She was spotted leaving the hospital with family Monday night.
"My daughter is feeling pain from head to toe," Rolando said.
"She has a broken bone in her mouth," Calalang's mother Jacqueline said.
According to family members, Laurene will spend the next few days, in intensive care. They say she was in town visiting from the Philippines
"She was just enjoying herself here and we don't know yet what her parents in the Philippines are feeling right now," Rolando said.
Laurene was also said to be getting married in just 3 weeks.
"Unfortunately, this thing happened and we're very sad about the accident," Rolando said.
Police say Touissant will be formally charged on Monday.
Police tracked Touissant through a side mirror from her car that was left at the scene of the hit-and-run. Officers tracked it to Touissant's 2006 Ford Fusion.
When officers arrived, Touissant said she was heading to police to turn herself in. She's being held in Camden County.