What time period was your Siddie Roberson born? I have Roberson ancestors from Conecuh (later Escambia Co. AL). My folks were William Benjamin Roberson born about 1800-1825 and he married Siddy/Siddie Coleman. Siddy was the daughter of Menan Coleman and Argent Jackson.
Argent Georgianna Roberson was a daughter of Siddy Coleman and William Benjamin Roberson and Argent Georgianna is my great grandmother born 1849.
Maybe your Siddie Roberson is another daughter of Siddy Coleman and William Benjamin Roberson. Sorry, but I don't know who all of the other kids are of Siddy and William Benjamin but this might give you a lead if you haven't already found your Siddie's parents.