If your looking for a great gift idea for your daughter - check out these Mermaid Tail & Swimsuits.
The ones that we've all purchased is from the company called Fin Fun! Great customer service and will run you in the low $100s.
My daughter and all her friends have had for a few years now and just LOVE! Of course they've came out with new colors so we'll add another one for her birthday this year.
They are well worth the price. Plenty of use and no issues. Do make sure that they are careful with their fin - not to hit sides of pool and easier and safer when put on sitting on the pool side.