Kafka's doll story

has anyone ever heard this? he was visiting dora diamont in berlin. they were walking in a park when they came upon this crying girl. kafka asked her what the matter was. she told him that she had lost her doll. he then told her not to worry since the doll was actually away on a trip, not lost. she didn’t believe him so he told her that he had a letter from the doll. when the little girl asked him to show it to her, he said that he had not brought it with him, but if she came back the next day, he would bring it. he came back the next day after spending countless hours working on this letter. and every day for 3 weeks, he brought the girl another one. he spent a lot of time, and put a lot of thought into these letters. finally, he had to come up with a believable ending. (he was leaving germany) he decided to have the doll get married. he wrote about the man she was engaged to, the preparations for the wedding, everything. by this time, the girl was so enamored of the story, that she had quite forgotten that the doll was gone.

i wonder what became of her and if she still has those letters.
she’d be in her 90’s i guess. huh.