Diana herself was most focussed on not losing her Princess of Wales title. She was paranoid they were going to demote her to duchess or something when her whole brand was the PoW. She did exactly what her son later replicated with the Megxit announcement, ie telling the public what was going to happen to try and fence the RF into a corner. That announcement included her intention to be known as Diana, Princess of Wales.
According to Lady C, the Queen and Charles had been privately thinking they should accord her the privilege of HRH Princess Diana in her own right. That would have been momentous since she wasn’t blood royal but they recognised a) she was going to be mother of a king and b) the entire world called her that already. However, when she pissed them all off by jumping the gun publicly when nothing had been agreed privately, the Queen said ‘well, we’ll take her at her word then’ and gave her the lesser title as well setting it out as a pro forma for future royal divorces.
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