It also depends on what the grades are based on.
For example: are the grades based on Summative Assessments or, Formative assessments, or, both?
Depending on the school's system or the Dept. of Education requirements, scores and grades will be based on these aspects.
Some schools only use Summative Assessments for grading.
Some use both Formative and, Summative Assessments.
I work at a school.
Elementary and Middle School and High Schools, may vary in how grades are derived.
So, you need to see HOW, and what, the school uses, for deriving grades.
It is not just an average.
And whatever papers you see at home that comes home from school, is typically not ALL every single piece of work, that is done or completed or not completed.
Then, for things like P.E. or art class etc., you will not see papers coming home about it unless they have class assignments on paper, too, for it. Not all teachers send home, school or classwork back home.
What grade is your daughter in?
Is this public or private school?
As the grade levels go higher, the work is more complex and the requirements are not the same for each grade level, etc.
So it cannot necessarily be compared... to last year.
And the strictness of a Teacher or not, does not reflect grading.
A Teacher, must, as a Teacher, grade according to the Dept. of Education's guidelines and requirements.
It is not just arbitrary.
Unless a Teacher is just so capricious.