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Itouikukuro Reigonamu is writing fictional tales about what happened in the Rokkenjima incident. Ange's tale would be placed AFTER the Rokkenjima Incident so, unless in the book Ange's tale were to be relevant for the plot despite happening AFTER the main topic, I don't think he would have gone through the trouble to insert it.
However Toya, by this point, is likely recovering his memory (it's implied he stareted recovering before writing 'Banquet') so if he hears that Ange 'vanished', he would probably wish to know more. If Ange were to vanish media would begin to nosy even more through her life and talk about it on tv and newspapers so Toya/Battler would have all the time to picture it in his mind. Media might have said that Ange was used to carry along a book/diary that she would read when she believed to be alone and that Kinzo's grandaughter acted like a witch, trying to summon her cousin, Maria, of whom likely the media had already talked like of a child who believed to be a witch since that's the reputation Maria had in her class.
Now, it doesn't matter if the book Ange carried around was Maria's diary or not and if she really did want to summon Maria or she was calling the virgin Mary or merely remembering out loud the happy times she had with her cousins.
This is likely enough for Toya's mind to create, along with meta and magic scenes also a more or less realistic version of how Ange's life was and what she had been doing until that point while he worries for her, adding, to this version, what he knew of his sister first hand, in short that she played with Maria and that the two had an arguments about a stuffed lion called Sakutaro which ended with Maria expelling Ange from Marriage Sorciere, saying she wasn't a witch apprendice anymore.
If he also owned one of Maria's diaries (let's assume Maria filled more than one) this might also have helped him to built up his own version of Ange's life.
People saying they might have met/spot Ange (because they had noticed a girl about her age with red hair) and denuncing the thing to the police might have given him the idea Ange was traveling because she wanted to discover the truth on Rokkenjima. Media might have supported the theory of Ange going to Rokkenjima because it's interesting. Acutally Ange might have gone to Rokkenjima for real.
However the fact he died there killed by the Sumadera, or that she killed Amakusa and escaped or that she wasn't either killed nor had to kill someone but became a writer are likely his speculations about what could have happened to her.
Although the fact that Ange vanished might not have relevance for Itouikukuro Reigonamu's tale, it likely had a relevance for Toya/Battler, in fact Ange become part of his 'inner world' and a driving force that insists that he'll defeat the witch (in short that he remembered his past and returned back to Ange who might have disappeared because she needed him and he wasn't there to protect her).
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