Professor Stromwell: If you're gonna let one stupid prick ruin your life, you're not the girl I thought you were.
At one point in the film, Elle overhears her friend David being cruelly rejected by an Alpha Bitch he was asking out. Knowing how sweet he's been to her up to that point, she takes this opportunity to repay him by pretending to be his spurned girlfriend in front of the other girl to help make him look impressive, and it works.
Elle's graduation speech at the end of the film, which shows how much she matured during the film and the Time Skip. But as the very last bit shows, she's still the same happy-go-lucky Elle Woods.
Elle: "Congratulations, Class of 2004. *flashes big, goofy smile* We did it!!!
The simple fact that Kyle, the handsome delivery man, is so obviously interested in Paulette, a woman who's self-worth could not be more low. By the Time Skip, they're married.
Elle's sorority sisters come to see her in her trial and are super excited to be there, eagerly showing up on their own free will. After how shallow these girls were portrayed throughout the movie, you can tell at this point that they really are Elle's true friends.
Elle telling her mom she got the internship - "Look at my name in black and white! Your daughter's doing something right!"
Elle and Emmett - "You were the best thing about this place..." and the rest of "Legally Blonde."
Vivienne telling Elle to get back in that courtroom and kick ass, because she can. (Also, she has the best frickin' shoes.)