Allison and her friends took colorful cards and markers and set up at the Bell ambulance station, WDJT reported.
“I’m writing, ‘You will feel better, and you’ll get through a tough time,’” Allison told the television station, telling her friends to include hearts or smiley faces on the cards.
"We're going to probably maybe go to Miller and pass them out," Allison told WDJT. "Mom will bring the bag and we'll pick them from the bag and then we'll give it from hand."
Allison got help from volunteers who dropped off cards and donations, some of them sitting down to help write out the cards, WISN reported. One of the volunteers was a Marquette University police officer who responded to Wednesday's shooting.
“I’m kind of processing. I mean, it was a very overwhelming thing to be a part of. (I’m) still trying to get grasp of what it was like responding,” Tom Wichgers told the television station. “To be able to get the support after the fact and being able to do things like this, it’s a tremendous help."
Allison’s mother, Tina Krueger, said it’s amazing to get cards from people who live far away.
"That's like the best, because you know someone is taking time out of their day, even if they don't live here, to think about police officers or people in tragedy," Tina Krueger told the Milwaukee Journal Sentinel.