To chapter or to not chapter?

I have a Soldier who has not passed a PT in appoximately 4 years. In that time, she has gotten Pregnant twice. I have only been her NCO for 8 months. I have tried to Motivate her to did deeper, counseled her(both verbally and on paper). She has made progress each PT Test, but still continues not pass. During the last PT Test she still improved on her run, but again did not pass. Her run times increase by 1 approx. 1 min and 30 secs everytime. I have forced her to run with me after work on days that I can make myself available, and on weekends. i can honestly say that I do not believe the effort or want is there. During the last PT Test, she was aware that if she failed, the Command would push for a Chapter. Once the Soldier finished the run, she was walking normally, and completed her Height and Weight. The Soldier later sent a text saying her foot was hurting and was going to go see the Medics. After Medical examination, the Medics found her foot to be broken. The Soldeir claimed it happened during the run. The Medic stated that it did not look consistant with an injury that would come from a run, and looked like an injury of someone dropping something on their foot. After, I can distinctly remember the Soldier looking to be in pain during the entire run. I can not prove or disprove when the injury occured or how. Legal, through the packet out, I was not told why, I'm guessing because they feel that because the soldier injured herself during the run, that being the reason she failed, it was not fair to her to be Chaptered. Just wondering what everyone elses thoughts are.