Oda not showing Boa is another fake out. Nobody believes that anything happened to her. She's completely fine and probably befriended Koby.
Catarina should be gunning for her head completely, even Shirahoshis too at least. Also Komurasaki assuming Catarina does have links to Wano or is aware of her somehow.
But this is Oda, I doubt Catarina even collects woman's heads or if she does, he's not ever gonna show it, its just more bait/false hype.
I really wanted to see Boa vs Catarina with Catarina trying to kill her but Boa wins ultimately.