Then Triton just comes and adds more of the heartwarmingness.
Triton: Just like your mother.
In her duet with her daughter, Ariel sings that when she finds Melody, she will hold her close and sing the song of the sea with her.
There's also a brief moment wherein we can see Ariel in her old grotto.
Ariel and Flounder reuniting after 12 years. Followed by Flounder (with no hesitation) agreeing to help his best friend find her missing daughter.
The ending of the movie, where the mermaids and humans unite and Melody is on her way to making lots of friends - she even offers a second chance to the kids who were rude to her at her birthday party, which they accept.