Is there anything that happens outside of God’s providence? Everything that exists is from God, not from some other source.
To expand on this, though, Christians have long understood evil to not be a thing that exists in itself. “Evil” doesn’t have being on its own. Light is something that exists, and darkness is the absence of light. So evil is a privation that exists in something that does have being.
All things that exist are good insofar as they have existence, or to use analogy, all light is good insofar as there is light. But if God allows light to not shine in every corner, but allows darkness in some areas, shadow in others, brighter light here, and lesser light there, that is ultimately His will. The light is created and is good. The absence of light is not really a true existing creation in itself, but it is within God’s providence to limit the light, so in a sense, it is within His domain.
So where there is evil, it may be very dark indeed, but what little light there is is itself still good.