Lily was engaged as the main attraction at the Haworth Gala. She was to ascend in a gas-filled balloon high above the crowd and then jump from the balloon and land using a parachute. On the day of the Gala, problems with the balloon caused the jump to be postponed but, on Monday 11 June, the balloon got off the ground. There was problem and she became separated from her parachute and plunged to the ground. She died soon after.
According to the Haworth Village website, there was speculation that the harness may have been tampered with - a relationship with another man causing jealousy. Another suggestion thought that as she approached Ponden reservoir she feared the balloon might land in the water and, rather than drown, she decided to jump. A very detailed account of the accident and the aftermath can be found HERE.