Ive felt the same way, though she did live in Rose Cottage. Perhaps the owner of the handkerchief was one of the Collinses who were around between 1841-1897 like Edith's children and their spouses (one of those kids fathered Judith, Edward, Carl and Quentin). More than likely a relation to Seaview's last owner, the supposedly eccentric bachelor Caleb Sayers Collins, who died in 1871 and left instructions in his will that only Collinses could live in the house for the first hundred years after his death. That's why Burke was unable to buy Seaview from Elizabeth as a wedding present for Vicki. I bet he was one of Gabriel and Edith's offscreen children who were away at boarding school when the events of 1840-41 took place. So, in a nutshell, Quentin Collins II's uncle was the master of Seaview.