The 20-year-old was arrested on suspicion of child cruelty. Her self-described fiance, Blake Hightower, 24, later turned himself in and faced the same allegation.
Both were medical marijuana patients, according to the San Bernardino Sheriff's Department.
The pair was being held on $100,000 bail each, Roxanne Walker of the sheriff's department told the Weekly Tuesday.
According to sheriff's officials, the childrens services officials tipped off a deputy about an informant who had video of Soliz's 23-month-old toddler sucking on a pipe that had marijuana residue in it.
The deputy, Lisa Guerra, tracked Soliz down at the home of the baby's paternal grandparents, arrested her, and obtained a search warrant for her home, where the pipe in question was allegedly found.
The baby was taken by childrens services officials and was scheduled to be placed in foster care.
The sheriff's statement notes that "... both parents had medical marijuana cards."