Los Angeles ? An illegal immigrant who stayed in a Chicago church for a year to avoid separation from her 8-year-old son, a U.S. citizen, was arrested Sunday and being processed for deportation.

Elvira Arellano, who arrived in Los Angeles on Saturday after leaving her sanctuary to campaign for immigration reform, was arrested before 3 p.m. outside Our Lady Queen of Angels Catholic Church where she had been speaking to reporters, said the Rev. Walter Coleman, pastor of Adalberto United Methodist Church in Chicago where she sought sanctuary.

Arellano was “being processed for removal to Mexico based upon a deportation order originally issued by a federal immigration judge in 1997,” U.S. Immigration and Customs Enforcement said in a news release.