The Killing of Helen at Notre Dame

Police discovered that a door close to where Helen was found had been forced open, with a small glass window having been broken. This means that it is probably the case that the killer was not a member of university staff. The message referenced the date of February 21st while Helen was killed just over a month later on March 22nd. Police initially speculated that Helen had indeed heard the break-in investigating it to surprise a burglar and was killed to ensure she couldn't give an accurate description of them to law enforcement. But I believe that it makes much more sense that whoever killed her was trying to reference some kind of perceived slight or insult from Helen that occurred on February 21st.