...for the first few weeks as that type accident can cause blood clots in older patients. The clot(s) can stay in the leg causing loss of circulation and possible loss of that leg, or travel to the heart, lungs or brain. If you notice ANY changes in the appearance of the leg or in her behavior get her an ambulance ASAP! DO NOT transport her by yourself unless she lives very close to the hospital(<2 miles)! The ambulance crew can perform advanced life support if anything bad happens. Don't worry about whether or not anything is a real emergency as this is one of those times you want to be safe instead of sorry.
I'm not trying to scare you, but with over ten years as a firefighter, First Responder and working with EMS; this is a possibility especially in older women with this type of injury.