What is the ruling on interrupting a four-rak'ah prayer, and what should one have done when interrupted during prayer?

We congratulate the questioner on the blessing of Islam and supplicate for her steadfastness and guidance. It is permissible for her to delay announcing her conversion to Islam or to stop praying if she fears harm to herself. It is commendable for her to strive in learning the rulings of Islam, to associate with righteous women, and to consider inviting her family [to Islam].