Hi, thanks for writing to HCM.
Taking into consideration the patients age and her comorbid medical conditions, its worth attempting conservative line of management rather than going for surgery (which may be very risky and at times may land in life threatening complications).
As her physical demands will be very less, I think the fracture
can be effectively managed by POP cast which gives promising results. The fracture will generally unite within 12-16 weeks in plaster cast.
Hope this helps