Marta, as Benoit's wealthy friend he calls in a favor with or something. Much like Hercule Poirot has that socialite friend that Tom Bateman played in the Branagh version of MotOE, who pulls strings for Poirot to help his buddy out, no questions asked. No need to directly mention any of the events of Knives Out so the film still stands alone and those who didn't see Knives Out wouldn't even need to know this character previously appeared, but I would love to see Marta in her new life as the HBIC, with all the resources and strings to pull at her disposal, running a successful publishing empire, and unfailingly loyal to her friend Benoit Blanc, lol.