L.G.
there is a book (theory) called "love and logic" that can help with questions like this. i took it as a class and remember asking the question about chores. i was told that kids should only be expected to do 1 chore at that age i thnk that it was well past 3rd grade when 2 chores can be fulfilled properly. personally i did not do allowance at that age mostly because it was a pain in the butt for me (they got enough from the tooth fairy and birthdays/grandma, when i did do it i just kept a chart on how much i owed them each week.
i do remember keeping identical individualized jars up on a shelf that i used to put in (or take out) dimes. those became a really big deal. They loved pulling them down and counting them, taking special pride that their name is on the jar but they did feel that they earned each and every one of those dimes. use a bad word, lose a dime, do something special and nice without being asked--get a dime...
I suppose you can put in a dime a day (unless earlier in the day she lost the dime for putting you in a position to take it away) and that would be 70 cents a week and when the jar is full (or once a month)she can pick a charity to donate a dime to, even if she donates it to her school... (it will make her feel important as she can see now that every dime counts)