Did she do an unprotected sex ,or took any ipill ,was this period she recently had was a delayed period,is she having any PCOs, thyroid etc ,has there been any physical or mental stress lately ,there are several reasons ,based on these information we shall be able to advise you further on this,u may get her to our clinic for a check up if u reside in gurgaon or get back to us on a direct Consulting.