Carla DiBello has a close relationship with its chief and little formal finance training, and her role is frustrating some officials at the fund

RIYADHBusinesses looking for cash from Saudi Arabias $300 billion sovereign-wealth fund, one of the worlds most influential investors, have found it helps to enlist a former reality-TV producer from Sarasota, Fla.
Carla DiBello, 35, has become a high-profile figure in Saudi Arabias investment scene for her connections with the kingdoms Public Investment Fund, or PIF. She is helping PIF negotiate a $445 million deal to buy a majority stake in Englands Newcastle United soccer team, say people familiar with her dealings….