Wheeling police officers took 48-year-old Dagmara J. Rouse into custody on Monday just after 11:40 a.m.
The Robbins woman allegedly gave four children, two 9-year-olds, a 6-year-old and a 2-year-old, the candy at Pleasant Run/Four Acres Park on Sunday afternoon.
All four kids became "fatigued and lethargic" after eating the candy, police said. They were taken to a local hospital for evaluation, and at least one of them tested positive for THC, a psychoactive compound found in cannabis.
Officers found a product labeled "MOJO THC MILK CHOCOLATE" while searching the park.
Rouse is facing four counts of Delivery of Cannabis to a Minor, four counts of Contributing to the Delinquency of a Minor and four counts of Endangering the Life or Health of a Child.
Wheeling police asked anyone with information to contact them.