Sarah Ferguson is committed to her daughter Princess Eugenie's royal wedding.

Princess Eugenie and Jack Brooksbank are busy with their upcoming big day. Good thing the couple Ferguson, who works with them diligently for the upcoming special event.

Although "it is very much Princess Eugenie and Jack's day, and they are leading the planning, Fergie is very involved," a palace source told People.

The Duchess of York's involvement in Princess Eugenie's royal wedding is expected. In fact, according to former royal butler Grant Harrold, Ferguson will be "on hand" with the event.

"I am sure that as with all mothers of the bride, Sarah Duchess of York will be assisting her daughter with all aspects of the wedding especially when it comes to picking the wedding dress," Harrold said.

"This is an important time for any bride and I have no doubt Princess Eugenie will be getting guidance from her mother while planning this special day."

In related news, Ferguson also reacted to Jan Moir's op-ed by sharing an open letter blasting the "bullying" article on Instagram. Moir criticized Princess Eugenie's big day for rivaling Prince Harry and Meghan Markle's royal wedding when she's way down the line of succession.

The letter was written by Sarah Wade, CEO and co-founder of Humanitas Charity, for which Ferguson is a patron. According to Wade, Moir's letter is "tantamount to bullying."

"I am appalled at the vitriol that is expressed in the piece," Wade wrote. "I would like to draw into question the purpose of the feature, is it to make a young couple feel embarrassed or ashamed of the choices they have made for their wedding day or is it to incite anger and hatred towards them? Either way, the outcome is negative and tantamount to bullying."

Wade also finds the piece "inflammatory and divisive" and added that it suggests Princess Eugenie's "hunger for glitz and glamour." She also questioned Moir's knowledge about Prince Andrew and Ferguson's youngest daughter and if he already met the next royal bride.

"It is imperative that we support freedom of expression, but not when the intended outcome is to inflict pain on another person or incite others to do so," Wade concluded.

Princess Eugenie and Brooksbank are set to exchange "I do's" on Oct. 12 at St. George's Chapel at Windsor Castle.

Princess Eugenie and Sarah Ferguson
Sarah Ferguson is very involved in Princess Eugenie's royal wedding planning. Pictured: Princess Eugenie and Ferguson attend Annual Charity Day Hosted by Cantor Fitzgerald and BGC at BGC Partners, INC on September 11, 2014 in New York City. Getty Images /Dave Kotinsky