Sweden Gillberg surname help!

Susan Richards

I have a Charlotte Gillberg, born 3 November 1762 in Stockholm, Sweden. She married Nicolaus Nilsson Skragge/Schragge on 19 September 1784 in the Katarina Parish, in Stockholm.

They had 5 children: Maria, Carl, Anna, Niclas, Johan Gustaf.

I can't seem to get any further information regarding Charlotte's parents or siblings and would appreciate any help possible.

Thanks! Susan Richards