I believe she's going to take the English and History. This year she's doing English/AP World History I. Next year is English/AP World History II, so we were told they shouldn't take the Subject Test for History until after next year.
That makes sense with the World, yes. If those are the only two she's doing, then not so off (you said a few, I thought you meant 3). She can do the lit anytime with prep (it's got nothing to do with any class, it's reading comprehension with mostly poetry, basically. It does use poetry terminology but it's stuff she should know and can get from a prep book regardess), but this is what I mean about scheduling -
So she's planning on the IIs at the end of jr. year, presumably May or June test date. Say she does the June.
So for SAT she now has Jan, March, May, and then the next October.
If she wants to have a retake date for the IIs, she's either only got October, which leaves her no last-chance SAT (if she has stuff in a later application cycle she can do Nov), or she does May and June for the IIs, leaving her Jan, March and the Oct for the SAT.
I'm not saying she's messed up or anything, but that thinking about this now is not really planning far ahead because if you left thinking about it until the END of jr. year, all she'd have would be May, June and October and maybe Nov.
Even the way many people are saying, like start thinking about it spring of jr., gives you March, May, June, Oct. realistically.
Also remember you have very little prep time between the month apart dates, because you get scores back in almost 3 weeks, so you only have about a week between getting the scores from the last test to retaking the next if you decide you didn't like those scores.