No, she was severely mentally ill and traumatized from a very neglected childhood and expected Prince Charles to make right everything that had gone wrong in her life. Had she not been blond, blue eyed and beautiful and titled, she most likely would have ended up in an Institution for the Mentally Ill. Instead her family and Prince Charles Grandmother manipulated him into a marriage with her.
The idea Diana was "mentally ill" or manipulated into her marriage has been debunked over and over again. It's true she suffered from an eating disorder, as did her sister, Lady Sarah, and bulimia certainly contributes to depression. She sought treatment and eventually was able to overcome her problem.
Diana and Charles both have stated they got married because they loved each other and for no other reason. While they both may have had doubts about the other, they did have a relatively happy marriage in the early years and enjoyed each other's company. The boys were a joy in their lives and both worked hard in carrying out their public duties.
Diana knew all about Camilla from the start and she did have bouts of jealousy over their friendship. Only when she herself turned outside her marriage for comfort did Charles do the same by resuming his relationship with Camilla. That was the beginning of the end and they both contributed to the eventual failure of the marriage.
Diana became paranoid and angry with the idea Charles fought comfort and friendship with Camilla. The more she focused on it, the more her negative side came out. She became convinced there was a plan to ease her out in favor of eventual remarriage. She refused The Queen and Prince Philip's assurances and offers of help. Eventually, she took her case to the media and tabloids, which was the final nail in the coffin.
Despite all of this, Diana was treated with the highest level of respect and dignity by The Queen, even when she didn't always deserve it. She was the mother of a future king and the weight of her position was always given full support by The Queen.
Once the divorce was over, Diana and Charles became friends again and were rebuilding their relationship for the sake of the boys. She had a good relationship with The Queen and was on her way to regaining a worthwhile public role. Sadly, her time had come and she passed away in a tragic accident.
It's time to let The Princess rest in peace. Charles has remarried and Camilla is now his wife. When the time comes, they will be King and Queen and that's how life goes.
Prince Charles will become a King, unless there is another Cromwell, who will aptly capitalize on external developments and persuade people into getting rid of the monarchy altogether. 
I understand that on a hot topic a lot of members cross post without seeing the last message. 
