Alavina Florreich, 70, was found guilty of five counts of aggravated sexual abuse of a child and two counts of forcible sex abuse in a court in Utah.
Florreich was the former nanny of a Chabad emissary in Salt Lake City.
Kaniva News reports she will be sentenced on 13 January and faces up to life in prison.
Her attorney said she will appeal.
Rabbi Avrohom Zippel, 28, and father of two, first came forward in an article in February in the Deseret News.
Florreichwas arrested in March 2018 on suspicion of 131 counts of child abuse.