It is narrated from Hazrat Abdullah bin Sa'd (may Allah be pleased with him) that I asked the Holy Prophet (peace and blessings be upon him) about the ruling of eating together with a menstruating woman. The Holy Prophet (peace and blessings be upon him) said: You may eat with her.
Hadith Referenceمسند احمد / تتمہ مُسْنَدِ الْكُوفِيِّينَ / 19008