Property manager says I can't raise rent

[Renee Granger]

Hi,

I had a tenant move out after only 1 month. The rent was $525. My property manager is charging her until we get a new tenant in the unit, which I agree with, since she signed a one year lease and broke it. My question is this: I'd like to increase the rent to $570. She (prty mgr) says I can't do that. I can see the situation from both sides. How do I get a tenant at the higher rent for the next year, while still honoring previous tenants responsibility of paying $525 until it is rented?  Any suggestions would be great. Thanks!

Renee