Lucinda (wearing a black ribbon in her hair in honour of mourning Ben) was with Julianne, checking final details and ensuring that everything was simply perfect for Narcissa.
Although she had taken quite a stand against Mrs Burke, she knew that today should be all about Narcissa and Draco, and therefore tried her best not to gossip or discuss the issue too much. The baby shower was, she hoped, an event to bring the society ladies back together so there was no need to discuss displeasing matters.
She probably spent much of her time with Hortense, Julianne, and Narcissa, but made sure to speak with Araminta about some orphanage stuff, and played good hostess and spent a little bit of time with everyone.
Lucy gave Narcissa tons of baby stuff that she had treasured when Daphne was just born like a nappie-away, unbreakable enchanted toys, and a bunch of baby clothes. She also got Narcissa a very classy baby bag for the rare occasion that Cissa carried her own things for the child (it was clearly more likely that the wet nurse would carry it, but hey, Lucy wanted to make sure that even Narcissa's entourage looked classy)