Thanks, that's more to work with.
Mabel's parents were William Shorter and Ellen Clark.
Mabel did have a sister named Ethel born abt 1888 in England
The 1911 arrival is logical. She married my grandfather in 1912 and my Dad was born in 1913
Wonder if Nettie is a nickname. She had a total of four sisters.
Would you mind telling me how you found the passenger list?
Really appreciate the help