Asperger’s refuses to do schoolwork

At school my first grade daughter refuses to do her schoolwork. The teacher messages me daily and I offer rewards for good days, like playing on an iPad, or her favorite dessert, as well as buying her a small toy after every five good days. On bad days she gets time in the corner, and none of those perks. I don’t know what else I can possibly try and hopeful that someone out there can share what works for them.