Elaine Wynn maintains fight to stay on board of casino operator Wynn Resorts

Elaine Wynn is maintaining her fight to stay on the board of Wynn Resorts Ltd., the casino operator she co-founded.

In an open letter to Wynn Resorts stockholders Monday, Wynn says that she is an asset to the board with "unmatched" experience.

Her letter comes a day after proxy advisory firm Institutional Shareholder Services recommended that stockholders vote for two other nominees for the board and not her.

Wynn is the company's third-largest shareholder, and has been waging a re-election campaign to stay on the board. The Las Vegas company, which she co-founded with ex-husband and Wynn Resorts CEO and Chairman Steve Wynn, announced in March that it would not nominate her for another term.