MABEL SONDAG-OFFERMANN Mabel M. Sondag-Offermann, nee Frierdich, 86, of Columbia, died Monday, April 17, 2017. Visitation from 4 to 8 p.m. Thursday and from 11 a.m. to 12 p.m. Friday at the funeral home. Funeral 12 p.m. Friday at the funeral home. Burial in SS Peter & Paul Cemetery, Waterloo. Quernheim Funeral Home.