(upi.com) - Heather Mills, estranged wife of British music icon Paul McCartney, could be facing surgery to repair a broken plate in her pelvis, the Mirror said Thursday. The former model and mother of McCartney's 4-year-old daughter, Beatrice, had her leg amputated when she was hit by a police motorcycle 14 years ago.A friend told the newspaper Mills is in "absolute agony" after a metal plate in her pelvis broke. "It separated after a screw came out. Two weeks ago, the joint moved and is out of line -- it's not stable. She could face a serious operation."It could take Mills up to six months to recovery from the surgery, the friend told the Mirror.Earlier this week, media reports said McCartney offered to pay Mills a divorce settlement of $51 million. Mills' legal team is said to be urging her to accept the deal.McCartney initially offered to pay Mills between $6.1 million and $10.2 million.As part of the newly proposed pact, Mills would get $51 million, but be required to keep quiet about her relationship with the former Beatle.