Wife gets a regular w2 but also gets a 1099 for bonuses from her job

Wife gets a regular w2 but also gets a 1099 for bonuses from her job. Do we need to complete the Schedule C in the business section, even though she doesn't have a business? Or can we report it as income in addition to her W2? If we report it under Schedule C in the business section, what deductions can be written off ? I would assume mileage, but since it's only for her bonuses can that be written off? Thanks