I always pity Marina, and her children about their financial situation after George died, because she was a royal widow, she couldn't ask for anything nor anybody moved to make sure she would still be part of the civil list, compare the Kent to the Gloucester and you would see how bad they fared vs that because of this. You could be royal and still not make ends meet.
You mean her son didn’t support her when he inherited the dukedom?
To be fair, he inherited the dukedom before he was even seven years old.
And on top of everything, she paid the death taxes in the middle of that, that is why she kept selling family heirlooms, and property until the end of her life, yes, very quietly but to no end. For years there was a history for "royal lady" whose earrings fall and one of the alleged diamonds fall into pieces, it was paste.
These are a Russian antique but not all of what you can see in the picture are real diamonds anymore.
I think the same story is known about her famous bow brooch.
Did Princess Marina's mother Princess Nicholas of Greece financially help her daughter?
I think Helen & Prince Nicholas were pretty broke by the time of Marina's marriage. All of Helen's fortune was tied up in pre-revolutionary Russia and the Greek RF were never rich. The men just married rich women mostly.
You are right, in fact, Princess Elizabeth, Countess of Toerring-Jettenbach, was one the main $upporter of her parents, and it is funny since Helen Vladimirovna didn't want her daughter at first to marry a simple "Graf" but as her husband, Prince Nicholas well said, they were immensely rich and those were the days were the Russian inheritance, and monthly allowance, vanished because of the Russian revolution, it also explains why Elizabeth's successors cling to family heirlooms while both Marina and Olga saw them go mostly, I read somewhere that Olga's family was able to hold some of them.
Marina's greater asset when she married the BRF was her blood and family connections for she lacked everything else, the Nicholas were poor by then.