Heather, Stop feeling sorry for yourself. Get off that darn pity pot and show these people you can rise from the ashes. Whatever you do, don't make promises that you can't keep. Be upfront and honest about what you can and can't do. They will appreciate your honesty more than promises that are consistently broken.
You can't do both, i.e., work a paying job and homeschooling. It's evident that you can't do this, so you now have to do something about it. You are off next Wednesday, correct? Then you need to call next week (Tuesday, since Monday is a holiday) and make an appointment to meet w/someone at the Board of Education and discuss enrolling your daughter into school. You are doing your daughter a grave disservice by not enrolling her in school. I believe she would enjoy having activities and homework to keep her busy. She's very lonely being at home and the only contact she has is with you.
She's at the age where she needs to be being preparing for life in the real world. You aren't going to be around forever and now is the proper time to start preparing her.
You are only one person and I honestly don't know how you thought you could do it all. But, the bottom line is YOU CAN'T!
If you are reading this posting, then you need to listen very closely...I do not want to see you on this forum until after work hours this evening. Your focus has to be on your paying job. The people on this forum will be right here this evening to check on you and we aren't going anywhere in the meantime.
Keep the focus on your job!
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.