Colour change doll?

[Jojoes]

My 4 year old dd has her heart set on a doll that will change colour in the bath. (She fell in love with one at a friends house.)

The one she wants had a swimming costume that changed colour. This doesnt seem to be available anywhere.

Has anyone got one of the disney princess bath beauty dolls? Or maybe the barbie mermaid one?

Would appreciate any advice or suggestions
TIA.

my dds both have one. They are Barbies I think, have a swim costume and a skirt. Panels on them change colour. Also colour change hair streak. Sorry can't be more specific, they were given them.

Pretty sure they are Barbies, and I have seen a barbie recently with colour change hair streaks - might have been in Asda?

Could it be the Lalaloopsy mermaid? Not sure if the swimming costume changes colour.. the hair definitely does.

Thank you both so much.