Searching for Synneva Andersdtr Tyssen - 1873

I am searching for emigration records or passenger list for Synneva Andersdatter from Tyssen who emigrated with her sister Ingeborg Stromme in 1873. She died en route and was buried at sea. They probably left from Bergen since Tyssen kommune is in Hordaland. I have had no luck finding any emigration or passenger list records. Any suggestions or help would be appreciated. Kathy