Don't give up. I would research every avenue to see if there is a way for him to provide more support, especially with her school activities and the "extras" that your daughter needs.

I know you feel bad about things, but there has to be some light at the end of the tunnel for you. You've worked so hard and have made every effort to have a good home for your daughter. Please, please still look into what, if anything, can help you out.

Don't give up. There has to be an answer out there that can help you.

Sit quietly, the answers will reveal themselves when you least expect them to.
The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.