My GP tears his hair out over this sort of thing- he says the Offsted targets take no account of medical statistics (how many infections a child is likely to have in any one year, the fact that some children's immune systems develop late etc etc). Children who are unlucky just get bullied by the schools.
We went through a nightmareish 3 years under the last headteacher, as our dd has well documented health problems which leads to a very high absence rate (over 30%). Despite letters from the school doctor, the GP, the paediatrician and an array of specialists, all asking the school to accept the situation and support dd, he still sent the EWO round and even tried to get Social Services involved. We had any number of nasty letters and he tried to "encourage" us to change schools. All for his blessed statistics; apparently the attendance rate was all that stood between him and an Offsted Outstanding.
SS came to a school meeting and sat there looking quizzically at him, then turned and said 'sorry, we don't do medical cases'. This went down in the meeting minutes 'Unfortunately, the Social Services are unable to get involved at the moment'.
As for any concern for her education- she was left without maths tuition for a whole term because they couldn't be bothered to put her set in the downstairs classroom (she was in a wheelchair)!!! The point being that they didn't need her to do well, as their maths were already good enough to get the Outstanding. It was all about statistics.
At the end of last year ht retired due to healthy reasons (wonder if he stills thinks it's a crime to be ill?) and the school under the new regime has done a complete about-turn. Dd is getting support, she is catching up on all the work she missed last year, she will do well. Ad I can ring in in the morning and explain that she's had another fall and not get sarky comments. But any letter about the attendance record goes straight in the bin. I don't need them to tell me that, and seeing the statistics won't make any difference.
She still has to sit through weekly assemblies on attendance, watching her friends get awards for not being ill. Noone has ever thought of giving her an award for struggling in when she's in pain. Or for catching up the work after she's been in hospital.
Sorry about long rant, but this trying to fit everyone in the same mould is so counter-productive. Common sense makes it clear that any standard childhood illness, apart from a mild tummy bug or a common cold, will make you exceed government targets. We got the same letter when ds had chickenpox.