Help with 19th Century German Empire Ancestors - Saxony

Question

Hello, I am looking for some help from folks with expertise in researching in the German Empire in the 19th century. My 2nd great grandmother, Clara Louisa (Schreiber) Ziegler was born in 1837 in Chemnitz, Saxony. She married Johann Christian Ziegler. They emigrated to the US, settling in Orange County, California.  

I'd love to break through these two brick walls and connect them with their ancestors, siblings and the newer generations of cousins.

Thanks