My horse has just recently become girth shy, she tries to nip at me when I go to tighten the girth. When I first got her 3 months ago she was not like this, she would stand calmly and accept the girth. When I go to mount she sidesteps away from me. I rode her bareback 2 days ago and she did very well. Even standing still when I mounted her. I have had the same saddle and everything the entire time I have owned her. I am just not sure what is happening and why she might be acting like this. If anyone has any advice please let me know.