Question

How was Harriet Tubman treated as a slave

Answer 1

Tubman had to stay awake all night so that the baby wouldn't cry and wake the mother. If Tubman fell asleep, the mother would be whipped her. so basically badly like any other slave. 

Answer 2

Harriet Tubman was treated like a slave because she had to keep watch of a small baby. If at any point Tubman fell asleep, the baby's biological mother would whip her.