A $25 million payout awarded to the teenage daughter of late billionaire Michael Wright mistakenly allowed for a "quite extraordinary" list of items, including Pilates lessons until she is 97 and the purchase of 20 pairs of $300 shoes each year, a WA court has been told.

The Court of Appeal is hearing a challenge by Mr Wright's estate to a Supreme Court ruling in 2015 that Olivia Mead should receive an inheritance of $25 million, instead of the $3 million he left her in his will.

Ms Mead, who was 19 at the time of the judgement, had argued the $3 million was not adequate to cover her "proper maintenance support, education or advancement in life".

However, in submissions on Thursday, the estate's lawyer, Jane Needham SC, said Ms Mead had "come to court with a quite extraordinary" list of items, which went beyond what was "adequate" and "proper" for her future.

Mead entitled to more than 'bread-and-butter' lifestyle

As well as provision for the Pilates and shoes, Ms Mead's lawyer had argued she was entitled to a home five times the Perth median price with "luxury furnishings", $300 a week for utilities, $950 per week for food, alcohol and fine wine, and two pairs of Tiffany and Co sunglasses each year.

Ms Mead had also said she wanted a diamond-encrusted bass guitar, worth $250,000.

Ms Needham said Mr Wright's estate "did not shy away" from the fact that Ms Mead, who is now 21, was entitled to more than a "bread-and-butter" lifestyle, but it argued the $3 million was enough to provide her with a house and and an annual income for life.

She said Supreme Court Master Craig Sanderson, who awarded Ms Mead the $25 million, had erred because he had regarded the large size of the estate as "trumping" any other factor in the case.

Court of Appeal president Michael Buss said some of the items were "just silly", and while he was not critical of Ms Mead because she probably did what she was asked to do, they had involved "imagination and speculation" which did not have any relevance to the case.

The $25 million award was more than double the $12 million Ms Mead had sought at the trial and her lawyer, Lindsay Ellison, said that sum "was a reasonable figure, and remains a reasonable figure".

Mr Wright was the son of mining magnate Peter Wright, who was Lang Hancock's business partner.

He died in 2012, aged 74.

He had a relationship with Ms Mead's mother, Elizabeth, in the 1990s, when their daughter was born.

The Appeal Court was told on Thursday that after the ruling in 2015, Ms Mead was paid $3 million, and the balance of $22 million was put into an interest-bearing bank account, pending the outcome of the appeal hearing.