What is the ruling on delaying the 'Isha' prayer until midnight?

Question:
This is a sister asking (H. M. A) from the Kingdom who says: Your Eminence, a girl is studying during exam days. The time for the 'Isha' prayer came, and she did not pray. She knew that the time was passing until it became twelve o'clock at night. After she finished studying, she prayed 'Isha'. What is the ruling? She is regretful about it. Does she owe an expiation?

Answer:
It is obligatory for her to repent to Allah if the time has passed, because the time ends at the middle of the night. She has to pray 'Isha' before the middle of the night. If she is negligent, she has to repent and seek forgiveness. She should pray even if it is after the middle of the night, but she should seek forgiveness from her Lord and not return to it. The Prophet (peace and blessings be upon him) said: The calculation of the night begins from the setting of the sun by the hour.
The point is: that the recommended practice is for her, indeed it is obligatory for her and for others, that the 'Isha' prayer be before the middle of the night. There is nothing wrong with delaying it after the first third, before the middle of the night. There is nothing wrong, but delaying it until after the middle of the night is not permissible.