I would so love it if she hanged around with Ash in the Johto region,like Dawn and May did,but she most likely will be forgotten for a long time like another remake protagonist. However,Ash didn't go to Kanto,so that makes sense.
I really don't get why people are calling her "Soul." They have the right to, but I don't get it really. Same with "Leaf."
Maybe as a Johto Dawn rival
Dawn won't leave until the 5th gen, this is just a remake, not a new generation.