
You really ought to be more aware of whether she has had one or not {"she does not seem to have had a season"}.
Is there any sign of her vulva having developed or her teats? She may have had a silent season, i.e. no blood show, but even so as I understand it there are physical changes to be observed when puberty is reached - the g#n#talia does not reduce to prepubescent size again nor the teats.
One of my own bitches had her first season at 21 months and I've heard of several in my breed being as late as 2 years so it's obviously very possible that your girl hasn't had her first season yet and is not necessarily a cause for alarm. If you are still in touch with her breeder I suggest you contact him/her and determine what the usual heat cycle is for their line.
You will have to ensure that you have arrangements in place for when she is in season to avoid an accidental mating - either arrange for the male to go off to family members or put one or other into kennels.
regards, Teri