Now free to buy a diamond-encrusted bass guitar, treat her axolotl to a life of luxury and convert to Buddhism, Olivia Mead says she is happy to be Perth's newest multimillionaire.

The third and youngest daughter of the late mining heir Michael Wright learnt on Thursday she had successfully challenged his will after a WA Supreme Court judge agreed she had not been left enough.

On Friday, clearly weary of intense media attention, she issued a brief statement.

"I am happy with the court's decision, and that I've finally been heard.

"While I understand the public's interest in my case, for now I'd just appreciate some privacy to come to grips with everything."

Ms Mead is the product of Mr Wright's relationship with Elizabeth Anne Mead after he divorced three earlier wives.

Her half-sisters were bequeathed $400 million each, but the 19-year-old was only in line for up to $3 million when she turned 30, and could have even wound up with nothing.

The will was worded so Ms Mead could be deemed an "excluded person" if she, for instance, incurred a drink-driving conviction or took a deep interest in Buddhism or perhaps Islam, Master Craig Sanderson found.

He also found she had received the bare minimum of financial support from Mr Wright during her youth.

And while a wish-list she had to provide of her expected future needs included some extravagant items - including the bass guitar and upkeep for her pet axolotl - she was not "a gold digger" and had just let her imagination run wild the same way most teens would if posed the same question.

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Soon-to-be-millionaire Mead seeks privacy