The Roberta Williams are multigenerational family of software programmers and developers.
Not much is known about the second Roberta Williams, or which era she lived in.
Roberta Williams III who may have been active during the 30th (Space Quest I and II eras) and 31st centuries (Space Quest III to X eras). Her latest game Kings Quest XXXXVIII - Quest for Disk Space was released around the time of Space Quest X: Latex Babes of Estros era.
One such Roberta is the proprietor of RobertaLand. Roger developed a crush on her after learning about her theme park. She may be Roberta Williams III herself, as the Space Quest III era is after all set a century after SQ1-2 eras when Roberta Williams III would have no doubt been much younger, or possibly even Roberta Williams II.