She was mentioning what makes marriage prohibited through breastfeeding. Amra said that Ayesha said, "There was revealed in the Quran ten clearly known feedings, then five clearly known ones were revealed afterward."
و حدثناه محمد بن المثنى حدثنا عبد الوهاب قال سمعت يحيى بن سعيد قال أخبرتني عمرة أنها سمعت عائشة تقول بمثله