Purity: Misjudging Time for Prayer
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 465:
If a woman does not perform prayers thinking that she does not have sufficient time to become ritually pure from an occurrence (ḥadath)[1] and to perform one rakʿah, and afterwards she realises that actually she did have time, she must make up that prayer.
-Ayatullah Sistani, Practical Laws of Islam, Purification (Taharah)
1
See the footnote pertaining to Ruling 384 for an explanation of this term.