NEC1099

I am doing my daughters taxes again and I have never had to enter a NEC1099 before.  She worked for Amazon as an independent contractor.  She earned over $3000.00 and no taxes withheld.  Where does all this information get entered?  I so far entered it on Schedule C but how about her mileage that she was told is deductible?  Personally I think I messed up because after I entered the NEC1099 information her refund really increased.