I am highly concerned about your daughter having swollen mouth
and tonsils. In Hand-foot -mouth disease, there are typically ulcers in the mentioned three areas with inflammation. If your doctor has diagnosed it correctly , then it is a Self limiting viral infection which will require some time. If she is feeling too much pain, it will be better to give paracetamol
for relief, give her plenty of oral fluids and soft diet
. Do not worry, it will get well very soon. Thank you.