Hello Anya, and a warm welcome to the site.
This must be difficult to know what to do and how you can handle this situation as unexpected behaviour may happen on the spur of the moment as you won't be able to anticipate what sort of reaction your daughter will perform, it may not be how she has reacted before.
A psychiatrist can prescribe medication, psychologists can't do this, but your doctor can also give her the medication but may want the psychiatrist to counsel her first, then on their expertise decide what to give her.
There are a couple of options, and I'm not a doctor to mention this, but I can suggest, the kid's hospital if she was admitted would prescribe medication and monitor her, the other way for her to get counselling is to contact the Kids Helpline 1800 55 1800 who counsel people from the age of 5 to 25 years, and appropriate people who talk with young kids would be addressed to talk with her.
These may fill in the time between now and April 22, but would really like to see what you think.
Best wishes.
Geoff.