I thought the review of The Crown in The Spector is spot on regarding series 3. Though there are bits in all 3 series that are incorrect or changed.
HMQ in series 3 is being portrayed as a cold heartless monster. It's almost like she is a totally different woman to the young woman she was.
I do agree that HMQ probably isn't very good at dealing with emotions so doesn't do them & that's probably why she can appear cold.
Maybe all the stuff that happened around the abdication, seeing her Father die young. Perhaps HMQ resented being forced to be Queen but felt unable or helpless to refuse as it had been drummed into her that she must be Queen.
Can you imagine the shock & upset if HMQ had refused to take the throne in 1952. The fallout would have been horrendous & she viewed as a pariah & most likely banished & shunned by her family & social circle. The general public wouldn't have like it either.