Trixe the Left-Hoofed Unicorn

When the "Guitar Centered" animated short for Rainbow Rocks came out, we were shown an interesting little bit of trivia. Human Trixie is Left-Handed. While all the other characters in the shorts held their instruments like a Right-Handed person world (Rainbow Dash, Rarity, Applejack), and in Equestria Girls when we saw characters writing they did so with their right hand (Principal Celestia, Cheerilee) and even Twilight, transformed into a human, favored her right hand when she held a pen for the first time.
But Trixie holds her guitar like a Left Handed guitarist would. She also pointed at Rainbow Dash, after she discovered that the guitar she wanted costs 12,000 dollars, using her left hand.
In Rainbow Rocks we see her again playing the guitar with her left hand, using a pair of scissors with her left hand as well, and pointing and gesturing using her left hand.

Does this reflect on Pony Trixie? Yes it does.
In Boat Busters, Trixie pointed using her Left Hoof. And when she was brushing her hair, she did so favoring her right side, like a person would do while holding a brush with their left hand.
In Magic Duel we see it even more. Every time Trixie gesticulates or points with her hoof, she uses her left hoof. When she removed the hood of her cloak from her head, she did so using her left hoof. When she made the scissors appear, she made them float favoring her left side and she did the same thing with the whip she used on Snips and Snails. When she removed the Alicorn Amulet, she did so using her left hoof, and held the fake amulet using her magic favoring her left side.
The other characters favored their right side. When Rainbow Dash flew away holding the amulet when she took it away from Trxie, she did so using her right hoof instead, for example.

Does Trixie ALWAYS use her left hoof and/or favors her left side when she uses her magic to levitate things? No. In Boast Busters she does gesticulate some times using her right hoof, for example.
But then again, neither does a left handed person always use their left hand, they just favor that hand over their right hand like a right handed person would favor their right hand over their left hand.
Trixie uses her left hoof and holds things magically favoring her left side more than she does her right hoof or side.
So does human Trixie, in Equestria Girls she enters a coin in the vending machine using her right hand, but that is most likely because the slot for the coin on the machine was on the right side because it was designed with right handed people using it in mind, just like everything else, which is always a problem for left handed people.