Article continues below advertisementSarah Ferguson has emerged as a growing concern for the monarchy, with insiders worrying she feels abandoned, isolated and increasingly volatile following a sudden rupture with Queen Camilla - once considered one of her closest allies.OK! can reveal the pair's fallout comes after King Charles, 77, stripped his brother Andrew Mountbatten-Windsor, 65, and Ferguson of their royal titles and honors amid renewed scrutiny over their links to pedophile Jeffrey Epstein.