on which all the lyrics for the album are featured including "Sorry seems to be the hardest word". These lyrics should prove that it IS the Elton John cover.
The album is listed on the discography page of her official site
BTW: The artist's real name is Lory Bianco. She was asked to adopt the name "Bonnie Bianco" at the beginning of her acting and singing career, because her producers felt that name sounded better. She changed back to her original name around 1989 with her album "True Love Lory".
The album "Lonely is the night" was only released under the name Lory Bianco.