I posted on the other thread, but my background is that I taught early years education, and now work in a university, and specialize in education research.
To be simple - the phenomenon you are describing is 100% normal. That doesn't mean it is right or good, but it is very challenging to fix.
The simple fact is that generally speaking class sizes are too big for the number of teachers that they have. That means that the teacher has less bandwidth of time and attention than they would ideally need, if every student was getting what they deserve/need. Imagine a teacher has 100 "points" of time/energy, and 25 children, that each need 6 points of time and energy. 150 are needed, and the teacher only has 100. What do they do?
They prioritize those 100 points towards the places that are going to have the biggest impact. This tends to be attention on the most problematic children, because those have the potential to cause massive disruption. And attention on the best/loudest children, because A. if not serviced, those children (and their parents) often cause trouble. and B. those children are useful for examples/guiding/helping other children.
The quite child in the middle? They are a teacher's dream, because they don't require too many "points". They save teachers because they get on with their work, and allow teachers to put their overstretched attention on the children who are screaming for it.
Is that fair? No. I was a quiet child, many people are, we get a bit ignored. But please try and look on the bright side:
1 - Your teacher probably loves your daughter, and is very thankful and impressed that she can get on and do things by herself, even if she doesn't have the resources/time to show it always.
2 - Quiet, hard working, disciplined children do well. You say your daughter is average in ability - but she is clearly great in attitude, and that should give you a lot of confidence in her future
3 - She will find places where she will be recognized. External, smaller groups are great for quiet hard working children, clubs, activities etc. Or she will just find teachers who are better at managing their "points" or have less troubled students, where she will be recognized
4 - you can recognize her, and make up for her teacher's missing praise. Get her a nice gift when the year ends, and say how proud you are of her etc. (I'm sure you already do these, but if she is craving recognition at the moment, perhaps she could use more)
You can complain to the school/teacher, and that will likely solve it a bit. Because then your daughter becomes a higher priority demand for the teacher's "points" - the teacher knows that the daughter has a 'demanding' parent, (not saying you are, but that is what they will think) and as such, if they don't pay attention to her, they will face hassle.
But you can't do that for every teacher throughout your daughters life, so my personal opinion is to follow another path.