Last date of menses was 25th January. You have not mentioned if she had sexual intercourse after that. If she had, there is every chance that she is
pregnant. Get her examined from a Gynaecologist who will confirm if she is pregnant or not. If she isn't pregnant, then she will have to take treatment for amenorrhea (absence of menses) as per the cause.
Next Steps
Visit a Gynaecologist
Health Tips
if she has a history of irregular menses, or prolonged periods of amenorrhoea without pregnancy, she will have to take proper medical treatment for the same.