All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu 'alyhi wa sallam, is His slave and Messenger.
Shaykh Ibn ‘Uthaymeen said: "It grieves us to know that this is done by Muslim women as this happens either out of ignorance or negligence and in both cases, it is a disaster. The remedy for ignorance is knowledge and asking, while the remedy for negligence is to fear Allaah The Almighty and His punishment and hasten to do what pleases Him. This woman should repent and ask Allaah The Almighty for forgiveness. She should estimate the number of days that she missed as much as she can and make up for them so that she would free herself from liability and we hope that Allaah The Almighty will accept her repentance."
Allaah Knows best.