We cannot say for definite. She left it opened it because it was a warm day and her room was hot. We think she left it open on purpose because she just keeps stating it was a hot day, but given what has happened we are sure she won't admit it was on purpose.
Hi Alex, Sorry for the late reply, we have had an unexpected visitor. Thank you very much for your help.
It is telling me "my expert has not finished answering" so won't yet let me enter a rating.