You won't know until you ask OP, so I would suggest either asking at the pharmacy or speaking to your community nurse.
But I would ask "Do you know why they would write the price on here like this?" rather than complain or jump to a conclusion (although I can see why the underlining and !!! might feel aggressive - how often is it said on here that it's hard to interpret tone and meaning from words on a screen?)
Otherwise I would either just let it go and try to remember that they have no idea what your circumstances are and whatever conclusions they may jump to are irrelevant because your daughter is getting the medication she needs. Or I would change the pharmacy I used.
But, having complained on another thread about twice being blamed for missing appointments when it was down to a mistake made by surgery staff, I do think it would be a good idea to make patients aware of the cost of things like this to the NHS. Not to make them feel bad but because actually we do benefit greatly from it and perhaps it would make some patients (not meaning you OP) a bit less likely to waste the resources.
I was reading this week about a new medication that might help patients with CF, but it would cost £190,000 per patient per year to implement if and when it becomes available in the UK. My friend has two young girls with CF and that medication would help them live longer, healthier lives if they could get it soon. Obviously my friends couldn't pay that even once for even just one of their girls, so if they were able to have it it would be on the NHS and things like this might be more available to patients if money could be saved elsewhere, like on missed appointments and wasted medications (again, not you OP, it's just that your thread, and another one about the cost of medication on a private prescription, got me thinking about the issue).
We were at the doctors surgery today and they had the missed appointments up on the screen. There were 474 missed last month and they can't all have been the fault of the woman who messed up mine
. I think they should put the cost up as well as the number, in the hope that it will make people realise what could be done with the money being wasted (including paying for much needed medication like your daughters OP.)