So the poster and the preview for the next episode pretty much said it. And since she's not old yet, it's possible she got wished to turn kid just like in the present? Perhaps, Trunks found a way to get into new Namek and take Dende with him to revive Shenron?
I know it's been discussed before and i haven't find any reason why he was getting stronger from Ginyu to Freeza arc especially Vegeta stated that Krilin's power was steadily increasing.