Hello Ma'am
I can certainly understand your concern
As per your symptoms, the possibility of Infection either in the Gastrointestinal tract or Genitourinary tract or both is high.
Next Steps
She requires a short course of Antibiotic and antiemetic therapy at the earliest.
Health Tips
In case menstrual cycle bleeding continues its advisable to get an ultrasound abdomen at the earliest to determine further course of action