(CNN) One of "Sesame Street's" tiny, young Muppets is dealing with a big, adult issue as part of an effort to help families dealing with substance abuse.

Sesame Workshop, the organization that produces the beloved children's show, has created a series of videos that features 6-year-old Karli talking to her friends about her mom's struggle with addiction.

Karli came to "Sesame Street" in May to stay with a foster family because her mother was " having a hard time ."

In the latest videos, she tells Elmo, Abby Cadabby and other friends that her mom had to go away for treatment and that she's now in recovery.

Karli told Elmo that her mom goes to meetings every day to help her stay healthy.