I think there is widespread misunderstanding about the details of the Hanoverian claim.
It definitely was not a case of manipulative adults pitted against a young Queen.
The Hanoverian claim was investigated by 3 eminent English jurists who found in favour of the King of Hanover because of the wills of George II and Queen Charlotte.
The jewels in question were valued at 54,900 pounds.
The Hanoverian claim was based on -- (a) the will of George II which stated that jewels which had belonged to his Hanoverian ancestors and those he had purchased with Hanoverian money were to be handed down to his successors as King of Hanover. Therefore, initially George II differentiated between Hanover and England.
(b) the will of Queen Charlotte in which she left her personal jewels to the House of Hanover.
When Queen Victoria became Queen of the UK, her uncle, a son of Queen Charlotte, became King of Hanover and as such claimed his mother's jewels and those which George II had signified had to remain with the Kings of Hanover.
That Queen Charlotte's jewels were purchased with English money (from George III's privy purse funded by the Crown Estates) did not, in the opinion of the jurists, give Queen Victoria a right to the jewels.
Queen Charlotte's jewels were private property, not heirlooms of the crown.