The teen was not living at the treatment center at the time of the alleged encounters.
Bond for Howlett was set at $50,000.
A north suburban counselor is accused of having sex with a 17-year-old boy who was in her care. Forty-one-year-old Noelle Howlett of Grayslake is charged with aggravated criminal sexual abuse. Prosecutors say the juvenile was a frequent runaway who met howlett while staying at a residential treatment center in Mundelein.