In Jainism, the idea is not that a woman becomes morally burdened during her period, but that certain temple rites require a higher standard of ritual purity. Menstruation (rajasvalā) is treated as a temporary state of ritual non-purity (ashaucha) for specific idol-centered rituals. This is why some activities in temples are limited during those days. It is about how worship is performed, not about the woman's worth or spiritual potential.

Key points:

• The restrictions aim to protect the sanctity and hygiene of temple worship and are temporary.
• What is usually limited: touching idols and puja objects, performing abhisheka, entering the garbhagṛha (inner sanctum), and other ritual acts tied to puja.
• What is encouraged instead: study (svādhyāya), mental worship (bhāva pūjā), recitation or listening to pravachan, and acts of compassion or charity. Many communities support svādhyāya and bhāva-pūjā from outside the sanctum.

Differences between Digambara and Śvetāmbara:

• Digambara communities are generally stricter about temple access and idol contact during menstruation.
• Śvetāmbara communities often allow distant darśan or non-idol worship from outside the sanctum; details vary by sangh and temple guidance.
• Importantly, there is no universal, scriptural rule that all menstruating women must be barred from temples. Local achar grantha and temple guidelines shape the practice.

Essence:

• Menstruation is a natural process. The language of ashaucha is about ritual cleanliness for certain temple rites, not about the spiritual worth or potential of the individual.

You can read more on this topic here and here and here .