He bequeathed to her one of his Stradivarius violins .
She was a grand - niece of Joseph Joachim , and she then studied with him in Berlin until his death , being possibly the only private pupil he ever accepted .
Joseph Joachim bequeathed to grand - niece 's one of his Stradivarius violins .
She was a grand - niece of Joseph Joachim , and she then studied with him in Berlin until his death , being possibly the only private pupil he ever accepted .