it was a very important appointment and I can’t just not turn up to collect her.
Since you have known you had this appointment from before she started school, and since you have known her school finish times for months (or even years through general knowledge), did you attempt to change the time of your appointment long ago?
I think the problem for me is that she’s not even of compulsory School age until Jan 2018 so the comment was irrelevant.
Your comment here is completely irrelevant.
My MIL is 30 mins drive from me & she doesn’t drive so she cannot take her to/from school.
What about buses? Tubes? Taxis?
She’s only in reception class so not fussed about a day, I’ll def call in sick next time
Please don't lie to the school and teach your daughter it's fine to lie about getting out of going to school.
It’s a medical appointment that deals with a serious health issue. Constructive comments or don’t bother
I am sure if you had simply told the singular lady on reception exactly what you have just told several hundred/thousand MNetters there'd have been no problem.