Why does any actor/actress get replaced in any series? Because they are only PLAYING a character and have other job opportunities in the acting world. Not too many actors/actresses are happy to be typecast into their on-screen role, so much so that people who pass them on the street refer to them and treat them as the character. Duh! Besides with "H2O, Just Add Water" the majority of the cast are only teenagers and most of them are in their final years. They grow up, get older and outgrow their role for the characters they play. It doesn't sit well with fans to suddenly be confronted by a stand-in actor for the same character but with Season 3, Bella is a completely new character with a different bio, but she does complete the magical mermaid trio and that's one of the themes that runs through the show: "the power of three", "magical trio" much the same as the Wiccan trio of the Charmed sisters.
Emma's family moves away, and Emma is later replaced by Bella, who has been a mermaid since the age of eight.you know they should have shown her leaving because someone might not like the new girl they should of done a vote.like who stays
emma will never come back shes replaced by bella and do u know lewis bella goes out with her in real life im not makeing any of this up its the trut.xxxxbut shes away for good but i dont want her to but she has sad.xx
emma left because she was working on another movie and couldnt do both h2o and the movie (i forgot the name) but in the series they say emma left to travel the world with her faimly then bella comes in. they explain it all in the first episode for season 3