You have given an interesting list of options above. If I were you, I would have to say that out of those options, loving and curious is the most likely. This is because all the others are too extreme and do not accurately describe the narrator. Certainly she is something of a "tomboy" by her own account, but she is definitely not sneaky and wild, as you put it. We can say that the narrator is curious by the way that she is always watching and paying attention to the changes that are going on around her, and how she picks up that something is going on and that all is not well. Then we can argue that she is loving through the way in which she develops a very close bond with Liberty, the dog that she is given and needs to leave behind in order to paradoxically gain liberty. Because she knows her dog is in danger if he stays, she has to scare him away, and out of love for him, has to be violent towards him:
Finally I have to resort to Mami's techniques. I kick him, softly at first, but then, when he keeps tagging behind me, I kick him hard. He whimpers and dashes away toward the front yard, disappearing in areas of darkness, then reappearing when he passes through lighted areas.
We can see the profound love that the narrator has for her dog expressed in the violence that she has to enact upon Liberty.