It happened around 5:50 p.m. Saturday at the Crossroads Shopping Center.
Police say 54-year-old Candace H. Mills-Brown entered the store and confronted a 42-year-old employee at the sales counter.
Mills-Brown allegedly grabbed the employee by the hair, pulled her down and demanded money.
Police say the suspect pepper sprayed the victim but was unable to open the cash register and left empty handed.
The employee ran from the store to shout for help while the suspect got away in a silver car.
A security officer from a nearby store was able to get the tag number of the fleeing vehicle.
Mills-Brown was taken into custody without incident and committed to Baylor Women's Correctional Center.