Hello genie47,
I do have a Louisa Vivash in my tree, but her father was Thomas and her husband was Herbert Osborne. However, if your Vivash family are from the East Dean area, there is a very strong possibility that there is a connection. There are hundreds of Vivashes in that area, and they are all related. Have you tried Genes Reunited? If you look for your Louisa there, you will most likely find her. There is one member who has done a huge amount of research on the Vivash family - he can be contacted through the site. Good hunting!