Hello! Thanks so much for your patience in hearing back from me!

I'm so glad that you have gotten a chance to use and enjoy HOD for several years. It sounds like your kiddos are progressing well.
From what you've shared, and keeping in mind that your daughter is a bit of a struggling learner who has found a good fit with HOD, I'd be inclined to just stay the course with her into high school. So, I would lean toward her continuing on into Rev2Rev and then into MTMM for her freshman and sophomore years of high school. Then, she would complete the World Geography guide as a junior and the World History Guide as a senior. This would work for her as far as accumulating needed credits in American history, Geography, and World History.
If you followed this sequence, you would need to add some to the government already included in Rev2Rev to earn government credit in that guide. You would also need to add some to the economics already included in MTMM to earn economics credit in that guide. Here are posts on how to do that for both of those guides.
Rev2Rev:
viewtopic.php?f=6&t=11256&p=81762
MTMM:
viewtopic.php?f=6&t=11286&p=81879#p81879
As far as the science goes in Rev2Rev, you will be set for a full credit in Physical Science with lab simply by using the Advanced Version scheduled in Rev2Rev. She can also claim a full credit in literature by doing DITHR, Rod and Staff grammar, and the Exciting World of Creative Writing as scheduled in Rev2Rev. Just be sure to challenge her book-wise with titles in the 7/8 Girl Pack (if she can handle those titles).
The Bible study in Rev2Rev is not credit worthy unless you add to it, so I'd lean toward adding something for Biblical Worldview to the study already included in Rev2Rev. Here is a link to a post that explains ways to beef up the Bible portion for credit if desired:
viewtopic.php?f=6&t=8208&p=59715
It also would not take much to add enough to Rev2Rev to award a semester of credit in Fine Arts for the composer study. There is quite a bit there already!

The link above mentions possible ways to do that. If your daughter is challenged in learning, I'd lean more toward just either additional listening to the great composers (logging additional time that way) or reading one extra book on the composers like either the Spiritual Lives or the Great Composers or The Gift of Music (but not both). I would also forego the papers, as she will have her entire lapbook of the composers and all that goes with that to show for credit.
Then, you would just need to be sure that you have your daughter's math covered for credit.
Last, you could consider whether to slowly begin a foreign lanugage, doing half a credit a year over 4 years of high school to earn two full credits in the same foreign language by graduation. This is the plan we will be encouraging through our guides. So, this is something else to consider. It would not be hard to borrow this from the World Geography guide. Otherwise, you can easily wait until later to begin this option.
Blessings,
Carrie