"CYO football is a full-contact sport designated for boys," archdiocese spokesman Ken Gavin wrote in a statement to ABC News. "There has been some perceived ambiguity in the policy regarding this point. It is currently being reviewed and will be addressed moving forward to provide complete clarity."
Pla said this explanation for the rule isn't fair to her daughter, or her daughter's coaches.
"At this age, Caroline is bigger than some of the boys, and she's gone up against boys both bigger and smaller," Pla said. "But she had great coaches, so she's playing the right way, the safe way. The boys never treated her different because she's a girl, and she was a good player."
The archdiocese has said it's reviewing its ban, and Pla that now that now that the holidays are over, she hopes to see a change.
"Her teammates don't want to see her go out this way," Pla told ABC News. "They want to see her back next season. And Caroline wants to play but mostly just wants to make sure other girls can play too."