Is it permissible for me to pray in congregation while I am alone in the women's prayer area after the muezzin has called the iqamah for prayer, or must I pray alone?

If a woman attends the mosque for congregational prayer alone, she prays behind the Imam and forms a row by herself. The proof for this is what Al-Bukhari narrated from Anas, who said: "I and an orphan prayed behind the Prophet (peace be upon him) in our house, and my mother - Umm Sulaym - was behind us."