Krista Woody, 35, was arrested on Friday.
According to the D.A.'s office, one of the minors was identified via surveillance video as the person who fired a gun in the direction of a highway in November 2021 in East Kensington.
The investigation then led them to Woody who, the D.A.'s office said, bought the gun one day before the shooting.
After she was arrested, the D.A. says Woody acknowledged that she gave guns to three minors in exchange for cash.
"The message here is simple: Don't be stupid. Actions like this have very serious and life-changing consequences," Krasner said in a statement.
Woody is being held on $500,000 bail.