Hi Alice
Can confirm that the "Maud Christina Laura ANDERSON" born 1899 is not "yours" (this lady married in 1926).
Of course with a surname such as ANDERSON, it can be a little tricky to find the correct person if you only have limited information to start with.
What we always recommend, it that you purchase a birth, death or marriage record for your relative, (in this case your g-grandmother), and then work backwards from the known information.
In this instance, purchasing a copy of the marriage record for Maude ANDERSON and George Boyer FIVEASH (1917), would give you the details of both their parents (and this is info which has been supplied by the couple, themselves, so it is a more reliable source.)
If you go to the NZ BDM website, you can find details of how to order a copy of the marriage record - the cost of which is $20.40. (For family history purposes, always request a "printout" of the record (rather than certificate) - as this gives the maximum amount of info. available ... and is the least expensive option.)
Once you have this additional information, if you add it here on your thread, then we can help you further.
~ Lu
