Melissa,
I'm so sorry for your loss and especially for your daughter loosing a father. There is a special place in the afterlife for parents who abandon their children (not to be confused with those parents who bless their children with the opportunites offered by adoption).
You need to find a support structure. Do you have family in the area that can help?
I would most certainly advize you to find a local place of faith and worship (a church or similar) and make yourself known to their leaders and community. Even if you're not terribly religious, you'll find people can be amazingly willing to help out those in need. Don't wait. Your daughter needs the help. Do it now. You need help - physically, financially, mentally, and emotionally.