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Message to Readers
Does Alice sound like a character that I could write a novel about and make it an interesting one? Do you get a vague idea of what she's like and what her life is like from this?
She's very sentimental. She likes most of the stereotypical girl things, butterflies and flowers, but not all of them (sewing and jewelry). She enjoys music like most teens and lives a little dangerously (the athame). She likes to be prepared (chalk and lots of books).
The umbrella. She's sentimental and still very much a child. It could almost become a flaw, if that interests you as a story topic. It would be cool if as she develops more in the story, she maybe does throw it away, to show she's become an adult. Or maybe she just debates throwing it away and decides against it again, reaffirming that she prefers to keep her emotions and child-like faith in people rather than growing detached and cynical. At the very least, it's a cool object to include.
Are the patches, keychains, and/or sewing patterns magical or do they have any ties to magical elements?
You could definitely write a story about Alice. I'm not sure if you have enough info here to write a novel, but she's fleshed out enough to warrant quite a few short stories at the very least.