I read a very good book when I was younger. Here's all that I can remember: The main character was a girl and the whole book was pretty much about how she used something like scrabble letters to choose how she would do something that day. For example, this girl would set different thing for different letters- A is I wear pajamas to school, X is I wear my holy communion dress to school, P is I wear a bathing suit, etc. She would then put the pieces in a bag and then reach in to pick one out. If she picked out P then she would (for example) do what she assigned it and wear a bathing suit to school. I think she did all of this is be wild and crazy for once in her life (she was either a wallflower or a goody-to shoes).

I'd really appreciate it if you could try to help me find the title and such of this awesome book that I very much want to read again.