Summary: Gandalf had lived longer than most people… for every person that he met and took Adventuring he wrote a book… a book in a language long forgotten… so at least their stories would never die.
Belladonna was the first Hobbit to gain a story, now best not to take this as fact that before Belladonna Took Gandalf had left the Hobbits alone in their Shire and in peace. Belladonna Took was merely the first Hobbit that took Gandalf up on his offer of Adventure.
For twelve years Belladonna and Gandalf traveled off and on, exploring the world that they called home. And when Belladonna passed after becoming Belladonna Baggins, Gandalf put quill to a blue book with her namesake embroidered upon it.
He told the tale from her birth, the ninth child of twelve. He told how her eyes lit up when he offered a chance to roam beyond the Shire borders. He wrote of how her hair shone like gold in Rivendell, and he described how her smile gave him hope.
When he finished their Adventures, he recalled how she finally felt the Settling, as she called it. How the one she would settle with built her a grand home and called it Bag-End, even making a special room for him so he could visit and how he stayed with them as often as his duties allowed.
Then he told of Belladonna Baggins' last great Adventure. He told about a child as curious as his mother, with the same bright shining eyes and the same joyful smile.
And when the last page came, he told how a brave Hobbit protected the Shire from Orcs and Wargs when the Winter Snows towered high in the Shire and how when the Snows melted and the flowers bloomed the following Spring Gandalf and the child of Belladonna laid her and the one she had Settled for beneath the withered old tree where the Grey Wizard had offered and Adventure to a Tookling with a skinned knee and tangles in her hair.
Belladonna Took was not the last Hobbit to be led Adventuring by Gandalf the Grey but she was the only one to ever receive a tale written by the Wizard. When the Wizard left for the Grey Havens with the Ring-bearers and the Elves he left his collection of tales in the hands of Aragorn, the King of Gondor, of course the tales were translated into Westeron so they could be read, the originals were left in the care of a Hobbit named Samwise Gamgee, who would treasure them as he did Bag-End, all originals but one… the story of a Hobbit girl who Adventured with a wandering wizard.
Could be friendship or more open to interpretation, I had a thought… sorry.