She most likely will have her big girl teeth in by 6 months, If it was me it is a good time for some bird work.. You can always come back to retrieving later, but i would bet if she had a chance to retrieve a downed bird i would bet she wouldnt pass it up,
Forced Fetch is a process were you are teaching a dog a conditioned response, another words when you say fetch the dog doesnt think about it, just does it....