Princess Diana's friends have said they think she would be "horrified" to see the way she is being portrayed now.The comments have come days before the release of the biopic Spencer, in which Hollywood star Kristen Stewart plays the role of the late royal.The film centres on one tumultuous weekend in Diana's life in 1991 when she and Prince Charles were plagued by rumours that their marriage was at breaking point while attempting to enjoy the Christmas festivities at the famous Sandringham