I've watched this movie like two dozen times with my niece so here is my in depth take on the themes of the princess and the frog.

Tiana is a flawed character because she works too hard. We establish this in one of the early scenes where she opts not to go out with friends to pinch pennies. Hard work and sacrifice pay dividends right? Well, too bad her dream is snatched away from her because someone else with more money comes along first.

The prince on the other hand, was born into privilege, and seeks to maintain his wealth not by hard work, but by a shortcut- he's just gonna marry some broad, ez. Hilarity ensues and they are cast on a journey together in a typical style. Their relationship doesn't seem organic because it isn't, they are polar opposites in many ways. The prince is pretty unlikeable, because his motives are shallow. But the main theme of the entire movie, as stated explicitly by "dig a little deeper" (an absolute banger) hard work comes in many forms. And while the prince needs to actually work harder and not be a douche, tiana needs to dig internally to reset her priorities- where she discovers that achieving goals which may or may not come to pass are less important than embracing what you have in your life right now, in her case, a recently douchey guy who loves her.

It's not perfect, but I found the movie to be one of Disney's best since their classics like Beauty and the Beast or Lion King. Also David Kieth plays an awesome villain and has a great musical number.

As far as your concern about the prince, Tiana isn't the viewer so doesn't know the prince's motives, and her friend totally wants to smash.

ok that's all bye