Based on my personal experience, at a little under 2 years old, I would expect about 6 eggs per hen per week from them assuming they are getting plenty of light throughout the day.
She definitely looks like a Black Sex Link pullet. Black Sex Links are very friendly and hardy, egg laying machines. I've raised them for years (along with dozens of other breeds and hybrids), and my BSLs have been my best layers, consistently churning out more than 300 large, brown eggs per hen...