Obviously I, going take into account of many of your explanations we should pursue a diagnosis but I realise many are based on jumping off the wall. She may just have not expected it to happen again and thought it was rare
No, most are not based on the repeat of jumping off the wall.
(Though that is an incredibly huge red flag - would the memory of the pain alone not have made her think twice?)
'Inappropriate risk taking' involves all the behaviour you have mentioned, including her behaviour at the exams - they usually read out the rules before getting started, and teachers usually advise about the rules ahead of time, yet she looked around and chuckled. She left studying until quite late. These are just examples you have provided.
'Decision making' involves disregarding all prior experiences when making decisions in the present, not just the broken leg. You mentioned impulsive purchases and other experiences that should have provided lessons but didn't.
You referenced the fact that she never learns from experience, implying that there is more than you have catalogued here (I would like to see examples of experiences she has not learned from that you base this conclusion on).