Elvira Arellano spoke at United Methodist Church on South Damen.
The undocumented immigrant called for an end to separation of families through deportation.
Eight years ago, she made national headlines after taking refuge for more than a year in a Humboldt Park church with her son, a United States citizen.
He is now a teenager.
Arellano returned with her second son, who was born in Mexico after going to the U.S. border and asking for asylum.