Information on the most money won before the game is completed is not kept. What about someone who had a higher total of over $90,000 and won the bonus round after. There are people who have done that and also a couple who did that. This quote from the Wikipedia Wheel of Fortune site found under the related link below the answer is the only actual winning records:
"The current record for winnings on a Wheel of Fortuneepisode is held by Michelle Loewenstein. On October 14, 2008, she won the Million Dollar Wedge, and received an envelope containing $1,000,000 in the Bonus Round. Loewenstein's grand total was $1,026,080.
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