Litigious Lottie, Lottie, the bender of the truth, adventuress and it must be said, woman of fortitude, forever remembered in English contract Law has never been recalled in photography. We have a black and white line drawing from Table Talk and one lithographic portrait of her en rôle and looking rather demanding. She does exist in photographic terms!
It turns out Lottie was listed in the postcards, though it wasn't one although the sellers speciality was postcards. Damn it.
Eternal vigilance seems to be not the only requirement for finding what you are looking for. Imagining the infinite permutations of a seller or holder's mind must also be taken into account.
But the story has a good end. The buyer responded to my mail and is willingly to make a copy.