I had a pair of heritage bronzes, from a very reputable breeder in the area, that were VERY late bloomers. The male did not start gobbling/strutting til a year old, and not visibly mating the hen til a couple months later; and the hen did not lay her first egg til she was probably at least 1 1/4 yrs old (early June last year).
HOWEVER, although I am not keen on the peter-pan-ness of the line, I gotta say I am a big fan of the hen (the tom got rude and stompy and belligerent and ended up in the freezer in the middle of last summer), because once she finally DID start laying, she alternated between laying and being broody all summer, and laid into early November. So I have kept her, and her son who is now my only tom (he has been another late bloomer like his sire but so far is much much more polite)
So, I think my point is, all is not lost. Last spring the turkey people I polled pretty much said that if the hen was not laying by early May there was probably something wrong with her, and yet, obviously not, in retrospect. So hang in there, maybe try upping their protein and calcium "just in case", or try adding another hen or two in the remote off-chance that's even feasible.
Good luck, have fun, hope yours turns out as well as mine did,
Pat