Idriel said:Somewhat immature?
You tell Diana would spend hours talking to her footman. Well if she had a loving husband next to her and wasn't left on her own, I don't think that would be necessary.
Nobody (the RF, Charles, the Palace) even tried to help her.
I agree that Charles should have rearranged his commitments, especially the trip overseas, to spend more time with her before the wedding, but she had no need to be lonely. She seemed reluctant to socialize with people (except the staff), perhaps because of her low self esteem and bulimia. But lots of people tried to help her, and she was encouraged to invite as many people as she liked to the palace.