The two children she had by Charles are in line to the throne after Charles is. That was her main job. To provide heirs to the throne. She planned to marry Dodi Faheed , a Muslim. At the time before her death this caused a bit of a stir in the UK.
No child that Diana had by Dodi would have any claim to the throne.
If there was a ‘stir’, it would simply have been because of his background.