Who is the Muslim and virtuous girl?

The dissimulatress is she who performs an action or an act of worship for people to see, not seeking Allah's pleasure, and "riya'" (dissimulation/show-off) is derived from "ru'ya" (seeing).

And a Muslim woman is she who has testified that there is no god but Allah and that Muhammad is the Messenger of Allah, and has affirmed the pillars of Islam.