Should I switch stables?

Hi. I am 12 years old and I ride horses. Me and my horse back riding instructor have always got along. She is being so rude lately. A girl had a party so I went. Because that's the nice thing to do. She leaves me a rude message. Like " In the contract you singed. You have to let me know if your not coming 24 hours in advanced." So I said "I'm sorry." That's not all she does. She posted on her wall a picture of a horse i put in the wrong album. I put it in the me and Dream album. She posted it to her wall saying "That's Amber not Dream". I say sorry again for no reason. She puts the horse I ride as her picture and says "Big girl hasn't got ridden in awhile." I missed it one time and forgot to call. She also Dident letting me canter gallop or jump only trotting. I have been riding for awhile and i don't think its fair. And when ever i help out she never lets me sigh the log anymore. I have try-ed talking to her but then she Just gets mad at me. I really don't know what to do... please help?