How should I get her to lope without going CRAZY?

My mare I'm training, Tex, she bucks and crowhops with me in the lope, but I only tried once which was yesterday...Honestly it was so fun! But if she does that again what should I do? I can still kinda control her but ehhhh.... not well. She is easy to control besides then though. Also I have my helmet on then in cause your wondering :)