do you have your daughter come back to the subject after all the other subjects are complete? Not necessarily. Sometimes I just had her come back to it after a different subject that used a different part of her brain.
What gets pushed out when she has to repeat a subject? As said above: privileges. It’s natural consequences. Unless she completed it earlier as part of the switching of subjects based on brain usage mentioned above.
Are there times when she doesn’t complete what you had planned but she did apply herself — it was just harder for her than expected? Yes.
If so, how can you tell and what do you do in those cases? As the mom/teacher and using your observation skills, you will know. Just like you know when they aren’t applying themselves elsewhere in duties/life or when you expect too much (which I think this is the exception to the rule) If she hadn’t understood it as well as I thought and was truly doing her best, I spent a few minutes going over it with her again, asking her more questions and having her show me some examples of how she thinks she should do it now that I had explained/shown it to her (that way she didn’t become accustomed to me doing too much) and let her try again. (After that second go, I’d put it away till the next day, review with her then, and did she have any questions).
I confirmed to her that I’m here to help, but that she has to TELL me that she doesn’t understand it-I cannot read her mind! If she had spoken up earlier, then less time would have been wasted and she might have been finished with the subject already. So that helps to teach some assertiveness and personal responsibility for getting understanding for her material and learning-which is vital.
In my dd’s case, I realized eventually that her brain was not grasping math and the English I had put before her to do. So I had to go back a couple of levels. But that LD was different than when she was just obstinate with material she had shown understanding of previously.
Also, I did give her breaks to go jump on her rebounder, do stretches, ride her bike for 15-20 min., go feed chickens, etc., when it was obvious that she needed to get her body moving in order to help her brain concentrate better and to control her body, too. Getting the blood flowing is vital to proper brain function. HTH