Have like a neon themed party like have music playing, have all the decorations in neon colors, tell everyone to wear neon, have like neon glow sticks and stuff there, and even have like a neon colored cake. Remember to invite all her friends and it you can have it where there's a pool then do that

family dinner with a few of her friends and a cake. maybe have the friends spend the night with her

Not having a party and concentrating on your education, then once you graduate and get a good job your whole life will be a party