Not until she's at least 3 years old, ideally, otherwise it's akin to a very young girl having a child.
Those involved in money making schemes, i.e. breeders, would obviously advocate mating at a much younger age but this does not take into consideration the animal's own development from pup itself to adulthood.
The kennel club, for example, still condones many breeds which between them have multitudes of health problems caused primarily by genetic misbreeding over many, many decades.
You should consider carefully your true reason(s) for wanting to do this. But ultimately it's your choice. Your doggie doesn't have a say, does she?