Who is kare loa en vening hilsen din sister hertha?

It seems like the phrase "kare loa en vening hilsen din sister hertha" may be a mix of languages or a specific reference that isn't widely recognized. "Kjære" in Norwegian means "dear," and "hilsen" means "greetings." If you are referring to a specific person named Hertha, further context would be needed to provide a meaningful response.