Hello, I would be happy to help you with your questions.
When we think about a cycle, the FIRST day of the last period is counted as day#1. Most women ovulate around day#14. Sperm can live in the cervix
for about 2-3 days. So the 'window' of fertility
(counting the first day of the last period as day#1) is about cycle days 12-16. So it sounds like there is a risk for pregnancy
Emergency contraceptions must be taken within 72 hours of unprotected intercourse
. While there are pills that can often be bought over the counter, the same thing can be done using birth control pills. She would need to talk to her doctor about the correct pill and dosing
I hope that this helps and good luck!