As a young woman, became romantically involved with the “archaeologist” Caladin Tar-vaniell.
After a whirlwind romance, who's mysterious events were the subject of Greensgate gossip for years, she eloped.
15 months later, she returned, baby lucretia_del_amore in arm. Though she was still obviously in love, Caladin was nowhere to be found.
Though pressed for information, Valerie refused to speak – of anything at all – for more than a year. During which time, it became obvious that Lucretia was a Half-Elf.
As a result of these events, Valerie's father Griswold Del'Amore declared her marriage annulled and her inheritance forfeit. Lucretia would have also been declared a bastard, if not for Esmerelda Del'Amore's intervention on her behalf.
The argument here was not so much a sentimental one as a practical one: Turning Lucretia into a bastard means that the circumstances of her birth will be relevant so long as she is alive. Instead, let it die with Valerie's disinheritance, and become only a historical footnote. An anecdote only brought up in gossip of exceedingly poor taste.