A menstruating woman was allowed to leave Mecca if she had done Tawaf-al-Ifada. Tawus (a subnarrator) said from his father, "I heard Ibn `Umar saying that she would not depart. Then later I heard him saying that the Prophet (ﷺ) had allowed them (menstruating women) to depart."
Sahih al-Bukhari Book 25, Hadith 237
← Previous Hadith The people of Medina asked Ibn `Abbas about a woman who got her menses after performing Tawafal- Ifada. He said, "She could depart (from Mecca)." They said, "We will not act on your verdict and ignore the verdict of Zaid." Ibn `Abbas said, "When you reach Medina, inquire about it." So, when they reached Medina they asked (about that). One of those whom they asked was Um Sulaim. She told them the narration of Safiya (812).

Sahih al-Bukhari Book 25, Hadith 236 Next Hadith → We set out with the Prophet (ﷺ) with the intention of performing Hajj only. The Prophet (ﷺ) reached Mecca and performed Tawaf of the Ka`ba and between Safa and Marwa and did not finish the Ihram, because he had the Hadi with him. His companions and his wives performed Tawaf (of the Ka`ba and between Safa and Marwa), and those who had no Hadi with them finished their Ihram. I got the menses and performed all the ceremonies of Hajj. So, when the Night of Hasba (night of departure) came, I said, "O Allah's Messenger (ﷺ)! All your companions are returning with Hajj and `Umra except me." He asked me, "Didn't you perform Tawaf of the Ka`ba (Umra) when you reached Mecca?" I said, "No." He said, "Go to Tan`im with your brother `Abdur-Rahman, and assume Ihram for `Umra and I will wait for you at such and such a place." So I went with `Abdur-Rahman to Tan`im and assumed Ihram for `Umra. Then Safiya bint Huyay got menses. The Prophet (ﷺ) said, " 'Aqra Halqa! You will detain us! Didn't you perform Tawaf-al-Ifada on the Day of Nahr (slaughtering)?" She said, "Yes, I did." He said, "Then there is no harm, depart." So I met the Prophet (ﷺ) when he was ascending the heights towards Mecca and I was descending, or vice-versa.

Sahih al-Bukhari Book 25, Hadith 238