My horse, a 17 year old Quarab has recently become scared of things that she wasn't in the past. It began a couple of days ago when we were cantering past a pool and she heard the buzz of the motor. She started spooking and almost threw me off so I dismounted and walked her around it both directions, while talking to her. I then got back on and rode her around it. After the pool she noticed a tarp on the ground. I walked her around it both directions and let her mouth it and eat some grass around it. I'm going to be placing one in the arena to get her reaquainted with it. Now she has been acting spacy around this fifteen foot stretch of the arena that she normally does well on. The first day I dismounted and lunged her instead, but she has done it again and I don't know what to do with her. She gets very ansy, and I'm stern with her. I also fly spray her before we ride and hose her down when we're finished. Any help is much appreciated.