Hi and thanks for the query,
I suggest the child might deserve a complete physical examination by her doctor.
of acute onset might have different causes. Other symptoms might be obtained during the clinical evaluation that the child might not actually be able to express.
Simple blood tests like a full blood count and markers of inflammation shall be important in ruling an infectious cause and ascertaining blood hemoglobin
I suggest you take an appointment with your primary care
physician, or if possible, your pediatrician
thanks and best regards,