Rachel Franklin went to swim, in the ocean, not far away from her home with Sarah Francisco(her mom) and Vicente Franklin(her Dad).

She was dancing and singing this doja cat song(Paint the town Red).
She went to beach called enchantix which was formerly known as enchantada ocean, but she's and Sarah Franklin (her mom) never knew that her great grandma (flora Francisco) ,a sirens and half vamp fell in love with two brothers Raphael Francisco and valentine Elko ( half brother of Raphael Francisco) and later valentine Elko died in war between siren and vampire, he was the one who turned flora Zack in to a vampire siren woman but she never ever fall in love Raphael Francisco, because she blamed him for his half brother death and but at the end of it all , she married him and she gave birth to her children ( Santa Francisco (her son) and Elizabeth Francisco(her daughter) .
Santa Francisco became the grand father of Sebastian Christopher Francisco (Rachel Franklin grandpa). Santa Francisco and Elizabeth Francisco his sister became the heir to the throne of vampires and other creatures of Mon high (town of vampires in Transylvania).
Santa Francisco became the king of all vampire, while Elizabeth Francisco became the queen of all sirens and half vampire, but she was rejected by the council of vampires,because she was a woman and Santa Francisco is the first child of their mother(flora Francisco)
Now after so many history, Rachel Franklin find a amulet of her grandpa sister (Elizabeth Francisco) on the ocean and it's written (oceanix) and Rachel Franklin said that word 3 times and was dancing near the Waves, think that, the amulet is fake , on till she put it(amulet) on her neck and dives in to the ocean and suddenly she pop out a beautiful pink tail .
And her hair color change as well as her appearance too, she looks so much like little mermaid (Ariel), but her hair color is red and pink. Her eyes are sea green color. She was so different than her real human form/vampire and welfwolf form . She was now queen of Oceania, the great of the mermaids and mermans. But now she has to go back home and tell her parents(Sarah Franklin and Vicente Franklin) about what happened to her on the sea.