It's great that your daughter is so healthy. My daugther was not diagnosed until 14 months old. She seemed really healthy too until around her first bday and she began to wheeze. Several visits to the Pediatrician later, she was admitted to the hospital and diagnosed with CF. I would give anything to have had those preventative treatments. It is necessary, don't let anyone tell you otherwise.
It's good that you are questioning your center's decision, we all just want whats best for our kids.