Ahh, so you believe God causes everything? You don't think humans bear any responsibility?
Assuming sound mental health, most humans are responsible for their behavior.
But the issue is HOW your God created humans. Many have mental defects and can't be responsible for their behavior. Some lack intelligence. Some lack moral concern. Some are attracted to authoritarian power and will follow immoral policies. Some will excuse corrupt leaders since their personal views are protected. A God could have created people mature and wise and consistently intelligent and mentally healthy. It didn't. Those people are what they are, not due to their bad choices. Children born with genetic defects and have serious illnesses is not their fault, so who's fault would that be if not the Creator?
What we observe in human and all other animal evolution is biological forms that exist due to the pressures of nature, not any God or supernatural cause. At best you can claim a God started life but let it do it's own thing. If you are going to push a biblical scenario then the Creator is going to be accountable for what exists, and exactly as it exists. I just pointed out better options for creating humans, yet your God created many humans with faults that are not due to their choices.
This world as portrayed in scripture is broken by sin. Sickness and pain are the result. This world isn't the end of the story, it's just the test.
Then it is all created this way by your Creator. If this God is perfect, then it made no mistake in creating people with defects. If sin exists, then it was part of what this God designed and intended.
And yes the rain falls on the just and the unjust. Karma doesn't exist. Good people and bad people get sick. We aren't living in heaven or hell... we are in between.
Almost as if no Gods exist the way believers think.
All will be made new. The girl will live on somewhere, hopefully in a perfect world where she will never know pain or loss again. All it takes is a little trust that God is good even though we can't see him working sometimes.
This is what humans tell themselves because they have no real answers.
This way of thinking was created because we humans assume we are special. If we are special why are little kids dying from cancer, like other animals? Well it must be that God wants them now. Why? Because whatever. The alternative is that we humans are just like other animals and we suffer like any other, no rhyme or reason. That's pretty scary. It's more fun to assume we are special.