....also...to add....
In closer inspection of the photos, I am seeing some toe curling in your gal.
That probably happened when she was a chick, and could have been caused by wrong incubating conditions, using wire cages as flooring in brooder, vitamin deficiency as a chick, to poor...
After a bird reaches maturity, it is very hard to estimate age with any certainty.
Some signs can indicate wear and tear that older birds often have (or very poor living conditions for a younger bird).
If her leg scales are flat and tight, she is likely younger. If her overall look is bright...