Cynthia Ann Watson entered the pleas Tuesday in a Riverside County court. She was sentenced to 60 days in custody, including 43 days in a work-release program.
She’s also ordered to stay away from her grandchildren.
Authorities say the 51-year-old resident of Aloha, Oregon, was visiting her family in Garner Valley — a community near Idyllwild — last month when she prepared the meth-laced tea to get high but left it unattended.
Her granddaughter drank some. The toddler tested positive for methamphetamine at a hospital but is expected to make a full recovery.