If it's the Iliad & Odyssey that are scaring you, then put those in the basement and don't think about them now
Just get ready for the rest of the year, go along as planned, and when it gets to about week 19 (2nd semester), then get them out & look at them again. If they still seem scary, post over here for ideas. At that point, you'll have a better idea of what she is capable of, and what she needs to finish for her high school credits.
For my ds, a good reader but one who does not like to read, we used a lot of audiobooks this year, including the abridged Iliad that is recommended in the manual. It doesn't change any of the words, it just takes out some chunks (you listen to one battle in detail, not every one, etc.).
Also, the Iliad study is very gentle. Marie gives questions in the manual to think about as you read -- things that have to do with Biblical ways vs. Greek ways. In fact the manual says that the Iliad is somewhat optional, anyways. So don't worry yourself about the Iliad, since you can skip it if need be.
The Odyssey is studied in depth at the end of the year, and by then my ds had grown a lot and was able to handle more. However, we did switch up some things for him, so that's always a possibility. I won't fill your head with those ideas yet, though, because you may well be fine, but there are Teaching Company lectures and Sparknotes and other helps out there, too, if you still are worried when you get there.
When I started AHL, David Hazell told me that if I've used MFW all these years, I should trust that they will have suggestions for different learners, will have a mix of easy and hard, and will have thought through all my concerns. He was correct, of course. I'll also add that I trust MFW programs to make it easy for me to educate my child well and prepare him for his future. I know those few advanced books pressed him forward to a higher level, prepared him for his future high school & college studies. And most of all, by the end of the year I knew that no one in college could tell my ds that the Old Testament was the same as any other mythology -- they aren't, and he knows it. He knows it in detail now. That was worth any pain and suffering with my non-reader in the challenge parts of AHL