A statement from her thanks Diana’s sons for inviting her to attend, but says she won’t go because she feels her being there could "divert attention" from the occasion.
Camilla had accepted an invitation from Prince Charles and Princes William and Harry to accompany them to the service.
However, the decision had been criticized because of Camilla’s affair with Charles when he was still married to Diana.
Friday’s anniversary will be marked with a nationally televised memorial service and specially commissioned prayers.
The Associated Press