Whizzy Pony

[kfrew]

My mum has recently bought a 15hh, 7yr old, ex BSJA pony. She is a sweetheart and is loads of fun. The problem is however, when my mum (who has been riding for many years) asks her for canter in the school she shoots off at a 100mph, she becomes extremely strong and small circles dont seem to slow down the pace either. This only happens in the school, she never pulls or shoots off out on hacks.
Any ideas on how to make the canter calmer?

 

[spookypony]

Maybe keep cantering until she shows signs of wanting to stop, and then insist on continuing? Let her canter, but concentrate on cantering well?