Anything at all about H2O Just Add water season 4 is it made does Emma come back does it exist?

"H2O: Just Add Water" does not have a fourth season; the series concluded after three seasons. Emma, portrayed by Claire Holt, does not return in any additional seasons, as her character left the show after season three. While there have been discussions among fans about a potential continuation or spin-off, as of now, no new seasons or episodes featuring the original cast have been officially produced.