There are several issues in all of this, none of them simple. Firstly
fried pizza shouldn't be on the menu at all
From my long experience of school meals in Argyll and Bute, it's extremely unlikely to have been fried pizza. The kids get that 'doon the street'.
Second, the school meals service works under a number of constraints. One is to deliver the service on a tight budget. Another is to get hundreds of pupils through (in all but the smallest schools) in the short time available in the school lunch hour. It's the equivalent of half a dozen full coaches arriving at a motorway services at the one time. They would never get them all back out and on to the coaches in half an hour, nor would they be expected to. But schools have to manage it somehow. Thirdly, there are the nutritional requirements, which are subject to regular statutory inspection. What was on the first plate certainly doesn't look as if it would comply with the Nutritional Standards in Scotland's Schools Regulations 2008 (I remember them fondly!) but we need to dig to get the full story, which I don't think we have here. In the 'changed culture' post-election, our new political masters will have to work within those same constraints and they will find that to be a lot more difficult than sloganising about a wee girl's blog.
Finally, I have a concern about the 'back story' here. Did this wee girl's parents complain to the education authority or the school before starting this blog? If not, why not? The wee girl's mother is a GP. Would she be happy with patients blogging about her bedside manner or the way she runs her surgery without having had a direct approach first and the chance to do something about complaints before they 'go viral'? Doctors, of course, get to strike awkward patients off their lists.
Education, whether in terms of what happens in the classroom or what happens in the dinner hall, is about a mutually supportive relationship between teachers, other staff, parents and pupils. It's about partnership. Personally, I don't think partners in a relationship should treat each other like this. I'm sure the lady GP in the case would say the same about the doctor/patient relationship if the boot were on the other foot.