I belong to a group that gets together to quilt once a week. We get donations of fabric from people who have passed or just stopped sewing. This may be a source of fabric for you. We saved fabric for a girl who was doing a school project once. Talk to the director, I bet she would be willing to help you. She may even offer space and a machine for you to use. I am so glad to hear you want to help these girls.
Forgot to mention where we meet. We meet at the Senior center