Below are some images with captions describing what happens during Ariel's life.
King Triton destroys Ariel's Grotto
Ursula takes Ariel's voice
Ariel has an Ariel has an adventurous personality, but sometimes lets her wants get the best of her. For example, Ariel unhesitatingly gives Ursula her voice, and signing her contract, not considering consequences.
Ariel Saves Eric
Ursula Manipulating Ariel
Even after making bad decisions, she (with Eric's help) still manages to defeat Ursula and follow her dreams.