Has she reverted fully to her maiden name, or does she use her present title and style of Chantal, Princess of Hanover? I see her identified as Chantal Hochuli in the press, but of course that means nothing, as the press regularly misidentifies names, titles, and styles.
ETA: Her (former?) boyfriend, Prince Alessandro Ruffo Di Calabria, is also the nephew of Queen Paola of Belgium as well as being the former husband Malfalda. I seem to remember there being some other personage that he dated, the sister of a female royal. Perhaps Marie-Chantal of Greece, or perhaps C.P. Mathilde. My memory could be foggy on that, though.