Not all her feathers have the stress bars right? They don't molt all their feathers in a short time frame it can take over two years for those first tail & primary wing feathers to be replaced.
The molt (replacing old feathers with new) is influenced by season (daylight hours), temperature, diet, egg laying, species and sex. Also, different types of feathers have different molt rates. A chick's first molt may take over 2 years to complete in some species. The wing and tail feathers may be the last to completely molt out. I personally have had African greys over two years old with some of their first tail feathers retained.
Since African greys first tail feathers are edged with a sooty looking black tip, it is very easy to monitor the progress.
Living indoors, in climate-controlled homes, molting can be thrown off quite drastically. When the furnaces are turned on for winter and when the air-conditioners are cranked up for summer, the temperature changes may cause a more dramatic molting process.
Production of new feathers can cause the metabolic rate to increase 30%, so nutrition and stress should be watched. Of course, today we are feeding our birds much better diets; so don't go overboard in the worry department.