Typically for that age girls use the womens size or 28.5.
The netball post for 11 year olds is about 3 metres in Australia.
10 feet official size ( 3.05 metres)should be the right size for her/him if you need to change the sizing personally would go with 9 feet.
If you are at primary school, it depends what year the school let's it. I started when i was in year four x
As a guitar teacher I can say yes, a 12 year old should play a full size guitar.
mabye get her involed in an club.
you could search the internet for the rules and let them watch netball games on you tube. And if they are in year 6 or bellow you can let them play in school netball.
if you want them to get proper practice it should be 10ft
usually in winter because if you play a lot then you will get very hot i mean temperature ok?not sex but cuz i play netball with my friends then i know cuz my friend told me YOU CAN play in summer but i wouldn't this is my advice its might not matter to you though i hope i have helped;)
netball was invented in 1895
Netball was invented in 1892 but was called Women's Basketball not Netball.
No matter what age we all have the same height and it is about 9 inch.