If the Teachers are not getting all her work turned in, even if your daughter said she turned it in... then somewhere along the line, not all work is getting turned in?
Then, is all of her homework, getting signed-off on, by you?
In this grade, they also get homework that may be due not the next day, but maybe a few days later etc. Is your daughter showing you all of her homework, for the week?
Does the students have a school planner, in which they write down ALL of their homework, daily? Where do they, write down their homework?
Is she, writing down, all of her homework? Or forgetting to write down all of it? Maybe that is where the gap, is occurring.
Maybe... she is getting all of her work done, that you see. But maybe there is also other homework, which maybe she forgot to list down or that she forgot about.
For some reason, the Teacher(s) are not getting ALL of her homework, turned in, nor is it all signed-off on.
So- before you go into that meeting, make SURE you know... how the Teachers and kids, get their assignments and homework, organized, and what the routine, is.
ie: The students must write their homework somewhere per what the Teacher tells them, is homework and when it is due. DO you actually see, her assignment book in which all her homework is written in?
And per getting it signed off on... this is from the Teacher or from the parent?
Make sure you know how the students are expected to track and note down their homework and the due dates... before you assume the Teacher is just picking on her. Then, ask the Teacher, HOW do the students get their work signed off on and WHERE and when do they turn it in? Then see, where the problem is.
Also, there is homework, AND in-class work too, that students do daily. So, which one is not getting turned in?
In 6th grade, there is a ton more homework and work, period.
And they have different teachers per subject. (at least that is how it is at my district's middle school). AND, if a child is does not know how to "organize" themselves, they will, flounder.
Thus again, see how the Teachers, delegate homework and how they tell the students to write it down and where and per due dates. Also per projects. And what is the daily routine of how... the kids get homework assignments. Or... HOW a student... goes about doing make-up work.