The Bonaparte would be totally wrong thinking that... If Eugène marry Maria Amalia of Naples will be put as King of Naples as replacement of Joseph (or maybe directly as replacement of his father-in-law)So, maybe Carolina has a heart-attack when the embassy arrives? I'd imagine it was sometime in 1804-1806 or so, around about the same time that her siblings (the duchess of Parma (1804), Archduke Ferdinand (1806) died. Archduke Maximilian died in 1801 (and he and Ferdinand were both younger than her) died. She was the last of Maria Theresia's children to die, so if we take a decade off her life and let her die in 1805, then will King Nosey agree? And how would this affect Eugène's prospects in Italy? Would he get the Neapolitan crown rather than Joseph Bonaparte/Murat? I could see that being an awkward moment if the Bonapartes think that now Josèphine's dead, her kids are no longer Nappy's proteges.
Hortense is married to Louis and Eugene will be always in favour (surely more than Murat and Bernadotte and likely more than Jerome and Louis). The only member of the extended Bonaparte’s family I can see more trusted than Eugène is Joseph and maybe Lucien if Napoleon decide to forgive him)