Good for her - better to boast on here rather than wandering round the playground telling all the other mothers!!! I remember wham my DD goat into learning capital cities at a very young age - put me to shame! Little boast of my own - she's trying for Cambridge uni atm!!!)
DD was given a Fibonacci based worksheet for homework by the school in Y4 (they had some of them doing enrichment maths with an HLTA in place of one normal Numeracy lesson per week).
It was a memorable moment here too. She gleefully insisted on mental maths "wait-wait-wait-[giggle]-ermm-wait-errm-six-thousand-wait..." and although she went further along the sequence, in Y4 she was an eight year-old.
[Then she had to draw lots and lots of rabbits but I'm trying to forget about that]
DD is currently a notable maths whiz in Y7 so no guarantees, but I think it is a a good sign and you're right to be pleased.