I have suffered from anxiety for years and have tried almost every homeopathic remedy there is! Things like Kalms and Rescue Remedy have never done a thing for me, the only thing I have had that has worked is a little bottle of liquid called Aspen.
This is available from Holland and Barrett with a little dropper and is applied neat to your tongue, and I have always found it calming. However I also believe that different remedies work for different people and it is just a case of finding one that will work for your daughter