Through the movie, The Little Mermaid (1989), Disney took a bit step forward in the way they presented women in their movies. Although Ariel's main focus was to date and marry a guy she just met, I do kind of understand Sebastian and her dad’s point on this one, she had a lot more personality than any Disney princess who came before her. The princesses who came before Ariel, Snow White, Cinderella, and Aurora, had little to no personality at all. And while Disney still had the archaic perception of a woman's only motivation being a relationship, this time Ariel was more than just a glorified animated prop to be in a relationship.
In the movie, Ariel is extremely curious about the lives humans lead, WAY before she even meets Eric. She is a closer representation to what young girls actually can be like, as she was rebellious against her father and curious as to the world around her. This helped advance the portrayal of women in Disney princess movies, as it showed a young girl (VERY young at 16) making decisions for herself, and even rebelling against decisions men had made for her. However, she still very clearly fell in ‘love’ with the first (human) man she even kind of interacted with and the entire movie’s plot was centered around how she was going to get with him, and what she was willing to give up to be with him, while he gave up nothing.
After this movie, Disney still had a LONG way to go to making a movie with a Disney princess that wasn’t centered around her relationship, but it was an important first step in the right direction to fully flesh out and give personality to a Disney princess.