Is she too young to get the immunisation? I know its normaly at 18months but maybe call and check - if you have it within 5 days of exposure it can help.

spots often appear behind ears and on the tummy.

DS1 had a very mild bout and only got about 10 spots but they really can be all over. If you notice any go to the GP to get it confirmed or not - also chickenpox incubation can be 14-21 days.