She may not need 3 doses. If you catch it right at the beginning, some only need 1 and are good to go. Homeopathics are such that you redose upon return of symptoms. So if the person takes the first dose and starts to feel better you wait and then then if he/she starts feels poorly again, it is time to redose. If he/she doesn't go downhill again, you just let the bug runs the rest of its course and let the immune system do its work.