Yeah, I really like the movie.
I must say that the still image of the baby-girl sitting in a catatonic state is haunting and unsettling. It had an impact.
As for "realism". I should have been more thorough in my commentary.
Her techniques are very solid, She is trained. This is apparent not only in the expenditure of a persons energy, but the recovery afterward. You may have noticed that when she moves her legs and feet (specifically when they leave the ground), her recovery is very quick and solid.... she becomes re-planted, balanced, and flexed in a fluid manner; that is a dead giveaway.
The "Realism" that I refer to is the odds of overcoming multiple attackers.
A hardened and trained fighter will be hard-pressed to overcome more than 2-3 opponents that are mildly experienced in hand-to-hand combat. Besting more than 2 or 3 opponents single-handedly and without a weapon is the stuff of Hollywood (for the most part).
She is simply too light to suffer the earnest attacks of several grown men that aim to do her harm.
There is a twist though. The fighting techniques of "beating up" are very different than maiming and killing. The latter can happen very quickly and with little energy or force. A person that is trained in the appropriate Arts could readily maim or kill a person (or people) twice their size, but on the same note they may not be able to "beat them up".
Never-the-less, She is amazing young Lady.
I have the utmost respect for her.