I'd disagree (as a teacher) that it's about personality. Loving the sound of your own voice does not equal marks
That's true. Brief, well considered and quietly spoken equals marks.
Some children (and a lot of adults) appear to think that the louder they shout and the more words they use, the more import their message has to convince others.
But we all know that's not true. It takes us adults a long time to muster the confidence to say what we really think. I wish that, as a child in school, it had even been acknowledged that I had a voice.
The nearest thing to Oracy we had in infant school in the early 60s was in Assembly. A religious thing with the Lord's Prayer and a couple of Hymns. "Now stand up if you have some News for us" the Headteacher would say, just before we were allowed to stand up and stretch our cramped limbs and numb bottoms. (Probably the precursor to my own childrens' "show and tell" assemblies, with a similar scrutiny of the information gleaned.)
The news was maybe that Mum had gone away to visit an Auntie.
Or that Dad had sent them a postcard from wherever he was working. But, whatever a 5 year old tells you about their private and personal life, is always very telling to the teacher. That's what show and tell is designed for.
To encourage very young children to be confident in speaking out loud is hugely important. It is NOT a judgement on her personality.
OP. It's not important. It doesn't matter. She will develop and gain confidence. Some do it soon but some later. My daughter, like yours, was quiet. Maybe because she is not challenged by the lessons. She understands it all, so what's to say?
Some kids are noisy gobshites, and they're not keeping up academically and they're just used to living in a noisy and turbulent environment. Yours isn't. She's quiet and measured and that's really to your credit.
Take it with a pinch of salt. Encourage her to be more outspoken, but don't push her. Her Oracy mark will not follow her to University.
Really. Don't fret about it. Been there. Done that. Recycled the t-shirt.