Giulia made her first WWE appearance at NXT Stand and Deliver on April 6, 2024, where she was shown in the crowd sitting with William Regal. On September 1, Giulia made her official debut in NXT at No Mercy following Roxanne Perez's defense of the NXT Women's Championship. She made her in-ring debut on the September 10 episode of NXT, where she defeated Chelsea Green. On October 1, Giulia failed to win the title from Perez after interference from the returning Cora Jade. The following week, on October 8, Giulia allied herself with the debuting Stephanie Vaquer to take out Perez and Jade. On the October 15 episode of NXT, Giulia saved Vaquer from a beatdown by Perez and Jade after Vaquer's in-ring debut, and it was later announced that the four would take on each other in a tag team match at Halloween Havoc, which Giulia and Vaquer won. At NXT Deadline on December 7, Giulia won the women's Iron Survivor Challenge to earn an NXT Women's Championship match at New Year's Evil, where she defeated Perez to win the title, marking her first championship win in WWE. At the Royal Rumble on February 1, Giulia participated in her first Royal Rumble match as entrant number 28, eliminating Jordynne Grace before being eliminated by Perez. At NXT Vengeance Day on February 15, Giulia defeated Perez, Bayley and Cora Jade in a fatal four-way match in her first title defense by pinning Perez. At NXT Roadblock on March 11, Giulia lost the title to NXT Women's North American Champion Stephanie Vaquer in a Winner Takes All match, ending her reign at 63 days.
Giulia made her return from injury on April 4 at a house show in Crystal River, Florida, defeating Arianna Grace. Giulia made her televised return on the April 8 episode of NXT, saving Vaquer from an attack by Jordynne Grace and Jaida Parker, but then attacking Vaquer, turning heel in the process. At Stand and Deliver on April 19, Giulia failed to regain the title from Vaquer in a fatal four-way match also involving Grace and Parker, the latter of whom Vaquer pinned.
On April 21, Giulia made her main roster debut on the Raw after WrestleMania 41 alongside Roxanne Perez, interfering in a match between Women's World Champion Iyo Sky and NXT Women's Champion Stephanie Vaquer. On the May 12 episode of Raw, Giulia and Roxanne lost to Iyo Sky and Rhea Ripley in a tag team match. On the May 16 episode of SmackDown, Giulia was announced as the newest member of the SmackDown roster. The following week, Giulia made her SmackDown in-ring debut, defeating Charlotte Flair and Women's United States Champion Zelina Vega in a triple threat match to qualify for the Money in the Bank ladder match but did not win the match at the event.