Not sure whether I haven't mixed the Queen/Consort ## - I hope Nong will not mind me adding what I heard from little birds, perhaps also interesting:
The Queen Mother Saowapa (#3) had her days switched in nights and vice versa. She breakfasted at 10:30 pm, visitors coming half an hour later, lunched at 2:30 am, last visitors leaving after 5 am. Also her 2 sons, King Rama VI and Prince Chakrabongse, had to wait often very long until the Mother will wake up and speak to them.
And she very much loved her grandson Prince Chula (son of Prince Chakrabongse and Russian Katja), so he had his bed placed in her bedroom, separated just by a curtain. Hence, he had developed similar habit day/night he had to get rid of once sent to England for studying. And when he was leaving Thailand (his father already dead, mother abroad) King Rama VII had seen him off to the Royal Railway Station, quite exceptional honour not given to others.
Queen Saowapa was also very fond of the young Russian girl when she was in secrecy brought by her son Prince Chakrabongse to Thailand (to a dismay of many). The Queen had helped her to learn the necessary royal court custom, also mastering the language. So, it was due to her help that the young Katja had been slowly accepted by other Royals.
As Nong already wrote above - in time when Katja was visiting relatives in Canada in order to enjoy a bit cool weather she was always so used to - the father of little Chula had developed another love to a local young girl Chavalit, wanting to keep her together with Katja. That's had not been accepted by Katja, so finally she left for HK where her brother was organizing Russian refugees.
Despite the two brothers - King Rama VI and Prince Ch. - had been always very closed (the King was thinking of his younger brother he could be once his successor, when no male heir is produced), the King was not willing to allow the brother be re-married (quite unusually strict that time...). But the Queen Mother had seen it more realistically: once the divorce had gone though, "let him married the girl". She was not happy with the King's unwilling position, then she did not want to speak to him, refusing also taking her medication. Letting him wait at her bed for one hour without seeing him, until he gave up and left without a word. That was the last time when the mother and son saw each other, she passed shortly afterwards, it was 1919.