Sophie Elms, formerly of Station Road, Wootton Bassett has already pleaded guilty to 16 counts of child sex abuse.
The 18-year-old admitted molesting two young children. She has also been convicted of possessing extreme indecent images of a child and pornographic images of an animal.
She will be sentenced at Swindon Crown Court on Monday.
Last October, a court heard how the teenage nursery worker sexually assaulted the two and three-year-old children between December 1, 2016 and March 11, 2018. In that period, she also indecently touched the pair.