I have just the marriage entry.
helina
Good, you found it, I should have told you that I had found it just using the surname - it came up first. Using that information (as printed in the index) you can order a certificate if you wish for further information and details of the marriage and parental information.
Searching the WA BDM index shows the birth of Isabel in 1907 - it is a rare surname and she is of the age to be able to be getting married in 1928.
KIESEY ISABEL Female CLAREMONT 299 1907 (Claremont is the district)
Her parents are not recorded in the index, nor for any other entries except a 1903 one -
KIESEY CHRISTINA father ERNEST WILLIAM mother MACKAY JEAN
district COTTESLOE 490 1903
the other birth registrations are quite some time afterwards, so might be children of a sibling, unless the family left the state for a while.
the link to the PO Directories - they go to 1950
http://www.slwa.wa.gov.au/pdf/battye/pods/Post_Office_Directories_Contents.htmlChristine.