It could just be me (or maybe Shiva is just that good an actress) but it seems obvious that at this early stage of the Batgirl title Kelley Puckett had no thoughts of Shiva as Cassandra's mother and that was later ret-conned in via editorial decision or Anderson Gabrych (who was great on the title too).
Also, Sandra Woosan's characterization previously didn't strike me as the type to have sex and get pregnant by the guy (as part of a business deal) who purposely shot her beloved sister. At least after the training and the baby you would think she would (try to) kill Cain for Carolyn's sake. But no. She just moved on.
But thanks for more examples of how awesome Cass is.