So, Miss Melody's birthday is in about 2.5 months now, and I am trying to plan her birthday…

So, Miss Melody's birthday is in about 2.5 months now, and I am trying to plan her birthday party...it may not be much, we have confirmed that my friend Bonnie, her husband Rick and their 3 kids will be there, and MAYBE my mother will come...she says she will but we'll see, she flakes most of the time. I'll be sending out invites via Facebook to save money, and hopefully others will come, too but I can't count on it because almost everyone lives in Cali...regardless, we are gonna decorate and make sonoran style hot dogs and elotes and a big cake and a little smash cake for Melody and we'll take lots of pics and swim and have a blast whether or not people come! Moving on.....I want to make it Princess Melody themed (Little Mermaid, Ariel's daughter), but it is IMPOSSIBLE to find any Princess Melody merchendise!!!! Apparently she is not recognised as a Disney Princess and I can't find anything...can anyone please help me find stuff or figure out how to pull this theme off??? I can buy stuff to match the colors and maybe make some things but I can only go so far on our budget....