She is a Sahâbiyah. When the kuffâr of Makkah persecuted the Muslims, many of them migrated to Abyssinia. She was also among them. Later, when Rasûlullâh sallallâhu ‘alayhi wa sallam migrated to Madinah, all those who were in Abyssinia also joined him. She also went to Madinah. Rasûlullâh gave her the glad tidings by informing her that because she undertook two hijrahs, she will be greatly rewarded.
Lesson: Look at how she changed from one who had a home to a homeless person, and this was done solely for the Dîn. O women! If you have to bear any burdens for the sake of Dîn, do not display any laziness.