Paul, at her age don't worry..... The first bull x I owned did exactley the same thing with his first catch, end of night, I was gutted!! Next night out, I stopped him eating it but retrieve...not a chance!
All changed with age, thank god. Ended up a very good catch and retrieve dog. Seen it a few times since with other young 'un's i've owned. Your running a very young pup with a very young pup mentality, no harm in that but even though the catches seem like she's grown up, her all round mentality just ain't.
I'd keep everything to a minimum, basic training still..... as Molly says in a few