She is probably a production red. Which is a RIR over New Hampshire. It isn't sex linked, but it is still a hybrid that will have hybrid vigor (superior laying ability).View attachment 1473630 Red sex link pullet, right?
This is a red sex link. They go by many names, as varied as the hatcheries that produce them. Golden comet, ISA Brown, Cinnamon Queen, Etc. They are all from a Red based rooster over a recessive white hen.