Hi Leavitbabe:
At the bottom of the Mumsnet Education page "Progress through the [National Curriculum] levels" - there is a nice chart which shows what the notional average child should be achieving at the end of each school year. Link here: www.mumsnet.com/learning/assessment/progress-through-national-curriculum-levels
So for Y5 according to these pages a notional average child should be doing work at NC Level 4C.
So 3c Writing (which I think we all agree is content not formation of letters) is a bit low and clearly needs work.
4b for reading/ maths - sounds slightly above average and doing well.
If you're having a parent/ teacher meeting I'd talk to the school about your DD's writing. Try and get at what the problem is - vocabularly, punctuation, structure, focus, etc... can all be issues that she may need to work on. See if the teachers can't give you some ideas of what to work on over the summer; however, some obvious ideas include:
Have your DD send postcards to friends, family, even teachers - and really say something, don't allow just a quick 'Hi! Having a good time'. Insist she really writes something.
Encourage your DD to keep a diary. Write about the things she enjoys or the things that bother's her.
Encourage DD to write reviews of what she's been reading.
Also - get her reading progressively more complicated books. The more she reads the better. Maybe join a summer reading club at a local library.
HTH