[JAS84]

I suspect it's just quite unfortunate, it only started being used for a terrorist organisation in about 2014, and even then is called ISIL too. So if she's 8 or 9 it might have been just beofr or during their peak time in the news. Actually you don't hear much about them any more and they ve change their name a few times so she'll probably be ok

Problem is it is a very common name for things as well as being a girls name. There's the river Isis, which gives it's name to the Boat Race team for example. 

Mind you there's Eta James, Ira Gershwin and Hama is a fairly popular name in some parts of the world

The superhero show DC's Legends of Tomorrow had a character who was based on the comic book character Isis. The show never used that codename, almost certainly because of the terrorists.

It's interesting that both CIN and Comic Relief no longer have 'official singles' - I wonder why that decision was made?

Probably because they end up making a loss, thus raising nothing at all for the charity. The 2018 and 2019 CIN songs failed to chart at all, and 2021's only got to number 23. 2020's did OK, getting to number 7, but that's unusually good - the 2016 and 2017 songs got to numbers 42 and 29 respectively.
Info from here:
en.wikipedia.org 

That only explains Children In Need though. Comic Relief's 2017 song got to number 9 and the previous 2 in 2013 and 2015 were number 1s. There was backlash to Ed Sheeran's music video from 2017 though, maybe that put them off doing any more charity songs.
en.wikipedia.org