Purity: Validity of Prayers Without Self-Examination

Practical Laws of Islam as per the teachings of Ayatullah Sistani

Ruling 403:

If a mustaḥāḍah is able to examine herself but starts performing prayers without examining herself, then in the event that she had the intention of attaining proximity to Allah and acted in accordance with her duty – for example, her istiḥāḍah was slight and she acted according to the rules of someone who has slight istiḥāḍah – in such a case, her prayers are valid. However, if she did not have the intention of attaining proximity to Allah or her actions were not according to her duty – for example, her istiḥāḍah was excessive but she acted according to the rules of someone who has slight istiḥāḍah – then her prayers are void.

-Ayatullah Sistani, Practical Laws of Islam, Purification (Taharah)