Sadly there is very little information about Ethel Oliver.
She was an Edwardian actress with a birth year listed as 1892. This undoubtedly is incorrect though since the name Ethel Oliver was very popular at that time and..
..since Ethel is pictured on a print at the National Portrait Gallery site, in the chorus of "The Orchid" at the Gaity Theatre,in 1903! I somehow doubt that she was 11 years old at the time!
The International Movie database has an Ethel Oliver listed in two silent Movies in "The Return" (1921) and "A Soul's Awakening " ( 1922 ). She was also listed as being in the chorus of the play entitled The Orchid at the Gaity Theatre in 1903.
There is no other info or pictures regarding these films and it is unlikely that there are copies available for perusal. Since Ethel seems to have spent her working life in the UK, she either moved here to start her career and retired to the US afterwards, or was here all along.
Ethel Oliver. (1892 - 22 Sep 1946)
* DEATH: 22 Sep 1946, Spokane, Washington
* BURIAL: UNKNOWN, Pines Cemetery, Spokane, Washington ????
The Above information was gleaned from a website owned by PPC collector.