Many fatalities in this sport start with a minor incident that begins a chain of mistakes leading to an unfortunate climax. As you read these, ask yourself if it could have been you. Experiencing a hard pull on a Racer pull-out, the jumper went unstable attempting to pull. After recovering stability, a second attempt to pull was successful - at perhaps 1,200 feet. The reserve planed neatly behind the main.
Pull outs have a statistically high association with deployment problems.
There are far better options. The Bottom of Container throw out seems to have the fewest potential problems other than a ripcord deployment. In this case, she should have gone to the reserve sooner. If you have an AAD and think that you are at or below 1,500 feet in freefall, you should just pull the reserve because there is a chance the AAD will fire whether or not the main is deployed. This is not a design problem in AADs and is probably true of all models.