And remember this is all inside Alice's head, so it would kind of make sense if she could do all sorts of crazy fighting moves considering it's all dreams anyway.
She's obviously got some talent with the Vorpal Blade, but I think that's more Wonderland than Alice actually knowing how to do that stuff by herself.
I started a fan fic that never went anywhere, but in the fic(you know how there's multiples of some weapons in case you missed them in the 1st game?) the more times you picked up a certain weapon, the more skill you had with it.
Not to say this is the case in either of these games, but McGee said Wonderland is Alice's super power, so maybe she get' SOME skill while there. I mean, I would be disturbed if Alice was suddenly a Matrix quality fighter, but yeah...
Idk, none of that made sense probably.