I have a 9 year old OTTB mare who used to be a lesson horse. I got her from the stable because she is a one person horse. when the other kids used to ride her they let her refuse the fences so now she wont jump when she have a few days off. Is there any thing i can do to teach her not to refuse? Once she gets into it she dowsn't want to stop jumping but as soon as she gets time off i have to go back to square one.