Hello,
Thank you for your query.
It is possible that she is pregnant but chances are slim.
I recommend :
-a home
pregnancy test if her period is late by more than 5 days
-if negative, repeat another test if period is late by 2 weeks.
See an
OBGYN with results even if negative.
Sometimes
hormonal imbalances/medications (including emergency
contraception), illness,
stress, travel, major lifestyle changes, weight changes, ovarian cysts can cause menstrual irregularities.
If the test is negative even after two weeks of delayed period, then she is not pregnant.
She should see her OBGYN if no period has occurred even after 2 weeks of due date.
Hope this helps.
Please let me know if there is anything else I can help you with.
Wish you both good health