doesn't require employers to provide paid sick days:
Am I entitled to Sick Leave? Vacation Pay? Severance Pay?
There is no Pennsylvania labor law which requires an employer to pay an employee not to work. Benefits like sick leave, vacation pay and severance pay are payments to an employee not to be at work. Therefore, an employer only has to pay these benefits if the employer has a policy to pay such benefits or a contract with you to pay these benefits.
http://www.dli.state.pa.us/landi/cwp/view.asp?a=142&Q=61106#8She could probably ask that she just not be paid for those hours and preserve her paid time off, but it'd be the same difference. There's also the option of checking into a workers' comp claim since her injury happened on the job, but I have no idea how that sort of thing works.