Ask the PTO. Sometimes the classroom teacher needs things done for her classroom that can be done at home.
I used to do the book orders (Scholastic) for all 4 of the kinder teachers..
When we were prepping for the fall carnival, I bundled tickets to be sold.
The office sometimes needed packets made.
Input information for the school directory, helping with the PTO website.
We had a school sign out front and once a week it needed to be changed out.. It was easy and only took a few minutes.
Ask the Music, Art or PE teachers if there are things you can do from home to help them..
Also I used to encourage parents to pair off with another parent to do projects from home.. Especially if you see another mom with a child your daughters age.. You guys can meet at each others homes to work on projects.