At two years old your manly chicken sounds like she might be having reproductive issues out of your control. Some hens develop masses in their egg producing factory that make them produce more testosterone than normal. I call it Henopause. For some chickens this seems to be a seasonal thing. In the Fall the days gets shorter and their body is telling them to store energy for winter resulting in less eggs. This process is controlled by hormones and if a hen is already on the manly side, you will see soft eggs, mounting, garbled crowing, and other rooster like behavior. Once Spring is in the air, the hen will resume egg production.
On the other hand, if the hen is getting ready to molt, you may also see soft shells and roosterly behavior. The aggression is from the pain of many pin feathers poking tender areas. If the hen is experiencing a hard molt she may quit laying all together until the process is complete.
Providing your hen with a varied diet including wild bird seed, cat food, cooked meat, and various dark greens may help her body adjust to these changes.