Is the tradition authentic that Lady Zainab (PBUH) hit her head with the pole of the tent.

Answer

In the name of Allah, this tradition is found in our authentic books. Anybody who is sane and normal would kill himself if he experienced some of what she (PBUH) suffered. So, suspecting or expressing surprise about this tradition does not emanate from the wise or people loyal to Ahlulbait (as). Allah is the All-Guide.