She is probably going to be a great gamer when she grows up, but Super Smash was designed to be accessible. Obviously some will have better strategies than others but as long as they are having fun it shouldn't matter. Smash might have a competitive following, but it isn't looked upon like other fighters.

So, at which arcades you usually hang?

j/k ;)

Her dad works at Nintendo

I'll answer your question with a question and answer. 

Despite growining up as a gamer and has more free time to play games as that's what he makes his living off of, why is Angry Joe so terrible at games?   Not that I don't like the guy, he's awesome, he's just a crappy gamer.

The reason she's better is it probably just comes naturally to her naturally and she's playing against a bunch of scrubs since gaming is no longer for nerds.  Aside from that, even though Smash Bros Brawl was released when she was younger, do you really think by the age of five she didn't have the grasp of understanding what she was doing?  Even if her family didn't have Super Smash Bros Brawl day one, she could have friends, family could have purchased it later, etc.

I was younger than 10 when I beat Ninja Gaiden, Ninja Gaiden 2, and many other difficult games on the NES.    

She needs to go EVO next year, so she can wipe everybody else.

True fighting games are were harder to master in the SNES era than what shes playing today in Smash. Street fighter taught people combo strategy through balanced attackings and progressing from poking to combos (as well as strategizing by fighter type). Back in that era Killer Instinct was played by a couple million on the SNES but only mastered by few. The accessibility and awareness that was needed to survive that game went unknown to most. Tekken and Virtua fighter in the begining were not as accessible as they are today. Once Tekken 3 came out it broke the cycle of technical nature and allowed for people who just want to have fun but the challenge themselves somewhat to join in (spammers).

I would love to see what would happen if they took the top fighters in the world at fighting games and challenged them to learn a brawler like Smash  The whole Smash community would learn some new tricks. 

I've faced people who were great at brawl and they got their asses handed to them once they touched actual fighters.

Camera work is awful, shaky as hell in the first and portrait in the first? Amateurs.

Well done to showing up pretentious game players.

This reminds me of when everyone made a huge deal about lil Poison, although he never actually beat any top players that I'm aware of.

Well, that's hardly surprising. You're good at what you practice at. You could probably take players who are great at Killer Instinct and have them get beaten by other people who have spent more time playing King of Fighters but I don't think that says anything other than the obvious. If the player is legitimately great at KI they'll probably beat the experienced KoF player when the game is switched to theirs.

SSB just plays incredibly differently. Stages are different, movement is different, the goal is different.
SSB is easier to pick up, so less experienced players are at less of a deficit, but a truly strategic player will win statistically more often.

She's pretty good, yeah.