Investigators released a sketch of the suspect on Friday night.
She's in her mid to late 30s and drives a red SUV. Police say on Wednesday she tried to lure an 11-year-old boy into her car.
It happened in front of Ida Prince Middle School.
Then on Friday, a woman approached a 3-year-old child at Galarza Elementary School.
The boy's mother was able to get him away from the stranger.
Police say the suspect's description in each case is similar.