very unlikely. Sha's family already went into ruin, we know that she's just trying to get her revenge against the school and will fail (because we already know the future and in there Sha is non-existence). The chances of her being relevant again is, imo, next to none.
This arc is honestly a filler arc, to give Komachi some time to figure out the next arc of Railgun that won't contradict with Index.
anw,
https://mangadex.org/chapter/e1b6c1b7-1526-43d6-adc7-98e25bff817f/14 this page screams "fateful romantic encounter" lol XD
thanks for the chapter