DD was the same, and also didn't show her skill at school for a while which I was frustrated with at the time. Turns out she's autistic but we didn't know that until year 8. I would leave it for now, the school environment and learning how to be with others is enough learning for the first few years.
She started being challenged and taken out for intervention with other higher ability children from about year 2 and much more so in year 5 and 6 ( what there was of it as that was the COVID years). She's at Secondary now, academically top 5 in the school, top set all the way through, invited to take Further Maths, invited to the Gifted and Talented group after school where they do all sorts of deep diving activities, research projects, trips to art galleries, guest speakers.
At home is what made the difference, I think and is applicable to all ability children, I never really exposed her to 'harder' stuff school wise but broader things so if she was doing a term on Great Fire of London, Egyptians, Tudors etc then we watched documentaries or went on visits to relevent museums and stately homes this gave her great understanding and context which she then used in her school work.
We go to the theatre alot and moved from CBeebies types shows to musical theatre, children's Shakespeare and now she loves proper Shakespeare and drama.
When reading I made the mistake of letting her access books of her ability level like Harry Potter before she was socially ready, they were so exciting she didn't want to read others so missed out on the Worst Witch and other series and really it ruined HP for her as she didn't have the life experience to relate to the characters like you do when aged 11 reading about an 11 year old.
If I was to do it again I would have her read the more age relatable and easier books and supplement them with a wider range of non-fiction, poetry, playscripts, comics, beautifully illustrated classics. To enjoy books as they are.