I've really been going back and forth on that. I realized when I posted that my decision to afterschool DD probably sounded a little strange, but this will be our first year homeschooling. I made the decision to keep DS13 home just recently, and I'm still working on pulling things together. DS is on the opposite end of the spectrum; he struggles with math and, although he's come a long way over the last couple of years, his reading level is still behind most students his age. He is also strongly opposed to DD being homeschooled. Of course, that's not his decision to make, but I'm worried that he will not be as productive if DD is here - when DS and I can work one-on-one, things go really well, but when DD or DS15 are also working with us there's a whole different dynamic. I think he feels insecure, and my hope was that we could build some confidence (and skills!) and then revisit the question of whether or not to have DD join us next year or even mid-year (which would also give me some time to map out some plans for DD).
Also, in second grade, there are a few more opportunities for advanced students, so part of me wants to see if this year will be more challenging and fun for DD, though perhaps that's just wishful thinking. ;)