After Alfieri's death Louise's companion was the artist François Xavier Fabre; it seems unlikely that their relationship was a romantic one.
Louise continued to live in Florence until in 1809 she was summoned to Paris by Napoleon who asked if she and Charles Edward had ever given birth to a child hoping they could then be used to try and stir up insurrection in Britain with which France was at war. When she replied "no", the meeting was abrubtly terminated. A year later she was allowed to return to Florence.
On Louise's death in 1824, he inherited her fortune, which he used to found an art school in his home town.