... Oh, I forgot to do those details. ^^; I'll edit.

She has to make the ofuda, using proper sized pieces of paper and the right kind of ink. The paper doesn't matter, the talismen just needs to exist and undergo the proper conversion into ofuda. She has to make them up beforehand.

She doesn't know what happened to her parents, she just remembers being raised by her uncle.

Not... huge? I don't have a clear idea for size but she can stuff a lot of ofuda in it. But it's still not really big or anything.