I'm on my computer and my 8 year old sister tells me that she fells like sh

I%26#039;m on my computer and my 8 year old sister tells me that she fells like she has a headache so i thought well maybe you are getting cold because on friday she went swimming. so i told her to go get me the thermometer so i could see if she has fever i put it under her arm and a few min later it started bepping so i took it out from under her arm and had ( 95.5%26#039;F) her normal tempature is 97.2 its was about 8 min ago is when i checked her tempature she layed down about 5 min ago and now she is asleep. WHAT DO I DO, our parents are asleep. do i just let her sleep until the morning and tell my mom. i%26#039;m kinda scared because of her body tempature being low 95.5f her normal body tempature is 97.2. i%26#039;m 14 and ive always watched my mom when she has to give my sister medacine for a cold because i might be babysitting her and she have to have some medacine. WHAT DO I DO? does she need some motrine?