I am sorry for the flu issues you are facing.
Unfortunately, your 17 year old daughter is going through a viral gastroenteritis
(the gut flu). This explains why she is having 100.2 degree fever
with pain on the pelvis and throwing up.
If she keeps throwing up, then, should start iv fluid replacement therapy in ER. If the vomiting
stopped, should give:
- plenty of fluids (water, juice, yogurt) with oral rehydration salt (ORS)
- BRAT diet
(banana, rice, apple sauce, toast)
- probiotics to stabilize intestinal flora
- tasectan or pepto
For the moment, she needs iv replacement therapy in ER, so, send her to consult a physician until vomiting will stop.
Wish fast recovery.