It’s a reasonable assumption.
this is all so stupid
by the time she was killed, she was divorced from charles and fighting a pr battle with the palace
for her to bed down with a muslim esp one as sleazy as dodi al fayed just proved their point that she was unfit to be a royal wife
they weren’t going to stop that marriage... i suspect they welcomed it as a pr disaster for her, and also more rationale to keep william and harry away from her