I have not been homeschooling for very long, but here are a couple thoughts that might help.
The first thing I would do is review the legal requirements for homeschooling in your state. If it's been anytime at all since you last homeschooled, they might have changed. You can go to the Homeschool Legal Defense website and see the laws for every state here: http://www.hslda.org/laws/default.asp
Click on your particular state to get more information. Here is a quick link to the laws for MA: http://www.hslda.org/laws/analysis/Massachusetts.pdf
There are two important things that may (or may not!) come up in your situation:
1. "The Court agreed with HSLDA and ruled the child did not have to be in public school while waiting for the school district to approve the home school." So you do not have to wait for approval from the district/school before you remove your daughter from public education.
2. "Home visits are unconstitutional if imposed against the parent’s objection. ...the Supreme Judicial Court ruled that “the school committee . . . cannot, in the absence of consent, require home visits, as a condition to the approval of home education plans.” Brunelle v. Lynn Public Schools, 428 Mass. 512, 702 N.E.2d 1182 (1998)."
On a practical level, you might want to get a copy of the school or district's learning standards for your daughter's particular grade. Our school district has these posted online. It would at least give you a starting point to understand what your daughter has been learning and what is left to be covered over the remainder of the year. You may choose not to follow it, but at least you will know. It sounds like she has been struggling with academics, so you might have to go back and review certain subjects until she understands the information she has missed.
Good luck to you and your daughter.