the most likely culprit is a viral infection. fever and/or chills are quite common in children for the first three days of a viral illness. at her age and association with other children a child can have more than one viral infection at the same time. fever is not dangerous and a temp of 101 does not necessarily need treatment unless she is uncomfortable.
last night at 8pm my daugter that is 5 yrs old had a fever of 101 gave tylenol then again at 6 am she had a fever again. and it was 101. 3 gave more tylenol and then now at 11am its 96 but she say she is really really cold and she has been saying she been cold for a long time like a week now