When both mine suddenly started to have Tourettes, the were both awful. It was about a year apart, and whilst it's usually a random illness, in our family we've been diagnosed as having Familial Tourettes.
I am so thankful for the medication. It reduces the number and frequency of their tics, in higher doses it can help with anxiety. They're both on Risperidone - which I think there is most evidence for. My DS is also on low dose Prozac for anxiety. Other drugs are used for tics - Clonidine, and Aripriprazole. There's less evidence for Aripriprazole - but it seems to have less side effects than Risperidone.
Risperidone's side effects are weight gain, sleepiness, Parkinson type symptoms. Risk of Tardive Dyskinesia - google it - on high dose & used long term,. Can affect bone mineralisation, can delay periods
I've found Drs have different attitudes to using meds. My DD is 14 & her Dr is keen to optimise her control. My DS's Dr is much less keen to increase his meds. My DS is suffering a lot with anxiety and agitation - I'd like his meds to increase slightly.
I understand why your Consultant is not keen, but if her tics are affecting her quality of life then I would push for consideration of them. There are Tourettes Support groups which may advise you.
It's important the school realise she's suppressing tics - because that is exhausting. Educating other children, teachers and parents is worthwhile too.