
I'd expect at only her second season she may be a bit immature to be bred from yet, as with most medium breeds the general consensus is to wait until they are two years of age before having a litter. Mine are usually on at least their third if not 4th season by the that time.
It can take a couple of seasons for the hormones to settle and to get a pattern for when a bitch is likely to be ready.
They also need to be mentally mature enough for mating and rearing and she may be better left another season or two, and certainly the general advice is not to mate to maidens, as an inexperienced male may well be totally off as regards gauging when a bitch is ready.
The males are much better at this once experienced, as many bitches either play hard to get (and won't respect an inexperienced male enough to allow mating), or are complete sluts and want to stand long before an experienced stud will deign to mate them.
I have had both situations where the bitch was all over the dog like a rash and eh would refuse to mete her for several days. Also had bitches unimpressed by a Novice male, but if proven shrug as if to say 'oh go on then'. I have also had maiden bitches that played hard to get, but with an experienced stud or patience we got there once she had warmed to the idea.
Another reason for using a more experienced older dog on a young bitch and vice versa, is for genetic and health reasons it is good to have a longer generational gap.
By using an older dog on a young bitch you will have a better idea of the longevity, health and producing record of at least half the potential parentage of puppies, added to the health screening results (hip scoring DNA tests for Kidney disease and eye diseases in your breed, clinical eye test), gives you the best possible odds of a healthy litter.