My mare has had 5 months under saddle,she's 6 years old. She's always had an attitude and can be lazy. We are now starting to ask for the canter more often and she always bucks the first time i ask for it ,after I've given her a tap and loud hey she'll pin her ears but no buck when i ask again. Shes been seen by a chiropractor twice and given the all clear and shes been seen by a saddle fitter as well. Any suggestions on breaking this behavior???