In Court, she stated that the scene had not been staged. The victims were shot where their bodies were found. Their clothing was not changed after death and there were no indications of people being other than unarmed civilians. Her team compared bullets dug out of the ground beneath the bodies with those recovered from bodies and found they had identical markings.
You can read a report of her testimony here.
or if you really like reading, here is the transcript of her trial testimony.
And heres a couple articles in which Dr. Ranta replies to what she calls all the nonsense about Racak.