Pick your battles. There are often too many behaviors present with an ODD student to try and address them all. Select those behaviors which are most troublesome and address those.
Establish a rapport with the student. Achieve a level of trust by responding to her with an attitude fairness and an even temper.
Involve the student in the plan to modify the behavior. Making the effort collaborative eliminates any sense of persecution that she may have.
Set boundaries and stick to them. The consequences of rule-breaking must be enforced evenly and consistently.
Use clear and simple instructions to communicate assignments. Take extra time to review the instructions with the ODD student individually, if needed.
Give positive rewards to reinforce positive behaviors. Small tokens, such as stickers, fun activities or peer recognition, can be helpful in the classroom.