She winces when she trips, not so much out of embarrassment or because she's hurt herself, but because the reactions are never good.
Falling is not a princessly thing to do.
Her father Frigg, a gentle lord known for his exquisite manners and calm demeanour, sighs and retires to his chambers to begin weaving a new spell. It takes time and time to complete, and works slowly - Loki has grown a few inches by the time she would notice a change. But her bumps and scrapes are now not quite so painful, and she never again falls in such a way as to injure herself significantly.
Odin is unsatisfied. A princess of Asgard must be a fearsome warrior, and the only one who fears Loki is the floor.
"Sister, why do you so often poke fun at me for falling? I don't do it to be funny."
When no instruction on magic from Father is forthcoming, she starts - unobtrusively - reading about magic in the library. It is not very instructional, but it is something. She takes notes. These are partly in plaintext - she would be in some trouble, if she were discovered, but that's more likely to happen at the reading stage than at the note-reviewing stage. Partly they are in her cipher, which she uses because not only is she uncertain of Thor keeping her distance from the private notes, but also she is quite certain that Heimdall sees everything. (Her processing notes are not even in the diary-and-planning cipher; these she has learned to do in code that not even she can read an hour later.)
When she has gotten through as much as she reasonably can without outside help, at her current reading level - years later - she seeks her father again.
"There are many things people are not allowed to do, that they accept because it is better to live that way than not," says Frigg. "We are not allowed to steal, or murder, or disobey our queen; it is dishonorable to lie, to cheat, to betray friends and allies. And it is against the nature of women to do magic, and against the nature of men to take arms except in great need."
The palace is big. She's lived in it long enough for her explorations to take her through almost all accessible parts of it, but sometimes years go by before she revisits a particular corridor. She chooses such an uncommon destination, unpopular because its doors are mostly locked. She taps them with her scepter, as she goes.
One of the doors has been left open.
She looks around. Heimdall sees all, but by default she isn't a tattletale.
She slips in.
"It should not have been," Odin growls, setting her down in the hall with a little shake and yanking the door shut behind them. "You could have died, girl. I have seen those who touch the Tesseract with their bare hands burn up from the inside. The artifacts of my treasure rooms are not a child's toys. Do not enter this hall again."
She leans into the embrace. "I went down the sixth floor west hall, the one with the room for all the old musical instruments that's usually the only thing open, and I was tapping my scepter on the wall, and one of the doors opened, and I went in, and there was a pedestal, with a pretty blue cube, and I liked it, and I wanted to pick it up."
"I'm okay," insists Loki. "It - told me things, I don't know how to say what things but there were a lot of them, and it put me on the floor, and I wanted to touch it again but Mother came in and picked me up by my tunic and put me out in the hall before I caught my breath, and she said I could have died, and to go to you."
It's so many tiny things - she numbers them, at first, because she doesn't know how many there are, and she gets to two hundred and nine. Then she invents little symbols that suit each one and puts them beside the numbers, and they should be hard to remember but they aren't because the cube told them to her.
She knows how to make these symbols spell long words, and what words will "sound" right and what words will not, and a little about what they might do...
There would need to be many many layers of building, words and phrases and sentences and paragraphs and pages and chapters and books and series and corpuses and shelves and stacks and libraries of letters before they would do anything.
But they will do things.
They'll do things and she has them and they're hers.
Loki grins from ear to ear, and starts composing a spell.