The Malaysian police are appealing for witnesses or information to assist in their investigation.
The 45-year-old is also assisting with investigations into a case of shop theft.
Grab has said that the driver's approach is not in line with their policy.
One user suggested the stall owner got fed up with customers who micro-managed orders.
The hen roamed around the drain for several hours, crying for help.
DPM Gan said the initiative was about "bringing delicious, nutritious, and affordable meals" directly to residents.
Mr Chan was sworn in as Defence Minister last Friday.
Some questioned why the taxi didn't stop and refuse to budge.
No casualties were reported, and authorities are investigating the cause of the accident.
Doctors said she may walk normally again in six months after surgery.