Falsic
So in other words When Hanabi travelled in another world, she travelled in time too So if they simply "slide" to the Narutoverse, they would be in the past, creating a different timeline (like Dragon Ball's Trunks and many stories of Fate's franchise) Also, if they do it, they likely would find a "younger Hanabi" probably, except they were to use some magic for the current Hanabi take her "past self" place Except they do it, saving this world, will erase any possibility that Hanabi cans simply return and recover her life