Let's apply a little common iense here.
Children are all different. We cannot and should not expect them to all reach a certain level at a certain point in time - there is natural variability in the population. Some children find 'school work' (I use the term loosely, having thought about and not found a useful alternative) easy, others find it harder. some children find one aspect of school work - e.g. maths - harder than another - e.g. reading. All kinds of factors - genetic, family background, illness, disability, specific learning difficulty - contribute to this.
I was perhaps over-simplistic in my post above. What I mean is that my aim (the reason I teach, nothing to do with 'targets') is for all children to make progress, understanding where they start from (and why they start from there) and moving them on. If I focus on 'expected levels' then I would set some children up to fail (and fail to recognise the huge progress they make by saying 'but you haven't reached the expected level') and would hold others back hideously.
To take an example from my class. I have a child who works at a lower level than expected for his age because he suffered some brain damage as a baby. I know where he is in all his learning, I provide opportunities for him to make progress in every lesson from that starting point, I assess where he is at the end of the lesson, as I do for all the children. I then start the next lesson at that point. He is making, and knows he is making, progress with a very high level of support. Should the rate of that progress start to bring him up towards expected levels, that would be fantastic and there is nothing that I and my TA would love to see more. Just because it is more likely that he will not reach expected levels but will make progress, does not mean we do not try to acheive this - but we will still rejoice in the progress he does make, so he has satisfaction as a learner.
Equally, I have a child who works very much ahead of expected levels for her age. She has always made more progress than expected in every year, which is why she is so far ahead. I would be failing in my duty as a teacher if I said 'oh, it's ok, she's achieved the expected level', or even 'it's OK, she's made the expected level of progress' - it is my role to continue to extend her, to see if she can continue to make this accelerated progress.
Indigobell - I do not know your daughter. If there is a specific barrier to her learning that has kept her within Level 1 and that barrier can be removed (am I right in thinking that she has just successfully learned to read?) then it may indeed be that she can 'fly up through the levels'. However, again thinking of my class, the children who sit at that level or lower in my class do not have 'one simple to remove' barrier that has held back their learning. With high levels of support and very targeted interventions to gradually 'chip away' at these multiple barriers, they are making good progress, but I might question how realistic a whole level during a 6 week summer holiday aspiration might be? As I say, i do not know your particular circumstances and whether there has been a failure to diagnose a specific problem that has now been solved, so apologies.