ANSWER:

It is totally prohibited for women to enter the masjid during their menses period.

Sheikh, pls i was told woman can enter the mosque during her period for purpose of islamiyya, that at the moment islaiyya is going on in the mosque then it is permissible.

Menstruation and post-natal bleeding | February 18, 2018 2:09 am
Previous

RE: menstruation, today I saw a bit of white discharge and did ghusl and prayed then I saw brown and red, do I pray or wait to see white again? Note this always happens and only the next day I see the coloured discharge! It gets so difficult
Next

For any reason, if I delay Ghusl 1 day after menstruation then what will I do? I wanna know the masalah about it