Sayyiduna Uthman (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) forbade a woman to shave her head.
Imam al-Bazzar recorded it; its chain contains Rawh bin Ata', who is da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الحج / 5607