Vomiting and diiahrrea are not normal signs. In fact, the kitten should lose their baby teeth and begin to sprout adult teeth without you noticing much change at all. Keep up with the medications the vet has given you and please take her back to the vet if there is no improvement. Watch for dehydration - vomiting and diahrrea can casue a small kitten to become dehydrated very quickly.
There are two ways to check for dehydration:
Pinch test - Gently pull the skin up on the back of the cat's neck and release. If the cat is well hydrated, the skin will snap back into position in a second. If the cat is dehydrated, there will be a 'tent' in the skin that takes longer to go back into place.
Gum test - With clean hands, lift the cats lip and gently press on the gum and release. The gum should turn white for a second and then return to a nice pink colour. If the gum stays pale or is greyish, the cat is dehydrated.