"Careful as she will get the better of you"

So my yard owner said I should start taking Belle out on hacks again (a few weeks ago I had gone out on my own and all hell broke lose meaning me doing the walk of shame back to the yard leading Belle). So I went out with my friend Lauren and a pony named Ted, she was totally chilled and very good until we got to the grass bridle way and I asked for trot...she tried to canter off totally ignoring my attempts to pull her up. Managed to stop and turn around and Lauren suggested we trot back que belle breaking back in to canter -.- once back on the roads she was fine! Good as gold again, maybe shouldn't have bought a ex race horse -.-

YO said I need to nip the bad behaviour in the bud or she will know she can get away with it, and then I'll have some really problems. 

Belle is a pain at times but I do love her.