Different things and systems will happen in different in classes within the same school.
If your child isn’t being heard regularly it is usually a sign that the school is confident they are where they should be with reading. It’s true that teachers will know this from literacy work and lessons and guided reading (if they’re doing this) and not just from reading individually. Personally, I think every child should be heard weekly but this just isn’t possible with the curriculum as it is.
What I’d do in your situation is to write a comment in reading log that DD seems to be confident on this book band and can she be looked at to move up?
Wait and see if you get a response.
If you don’t that will tell you it is not being looked at. Then approach the teacher directly or by email, whatever works for you, and mention politely that you made a comment and could they be assessed as you’re really pleased with progress and want to keep it up!
Trust me, you betcha she will be heard then and moved up if appropriate.
At the start of Y1, ask what the procedure is for hearing readers and volunteer if you can!