Thinking about it she
1: Came up with the idea of a choreographed song and dance number to escape from zazu in a matter of minutes! Shows how creative, and quick thinking she is.
2: Was always able to get the best of Simba in a pinning match. This is important when keeping him in check as a king.
3: Braved the unknown to find food and water for the pride.
4: Called Simba out on his bs when in the jungle.
5: During the battle for pride rock she didn't stay on the sidelines, she fought with the others in spite of her hunger.
6: She genuinely cared about Simba, not just because of his lion social status.
Three cheers for Nala!