"He looked peaceful. He didn't look angry," she added.
Heinrich said she broke three ribs and will undergo surgery this week to replace ruptured breast implants.
"They worked as airbags and have been ruptured by the ordeal," Heinrich joked.
Slater suffered concussion and whiplash, Heinrich said. But Slater managed to cycle on Heinrich's bike to a nearby business to call an ambulance for Heinrich.
Slater could not be immediately contacted for comment.
Heinrich and Slater work in a nursing home in the town of Clare and are used to seeing kangaroos in the area. But she never suspected a kangaroo might jump a bike, and is grateful their injuries were not more severe.
Heinrich's husband gave her a stuffed toy boxing kangaroo as a memento.
"It's all you can do now: laugh about it and heal," she said.