I have a horse (13) who has never had a problem/issue loading in the trailer until the last few months. She seems to have gotten in her head to not load and now it is a fight to even try, refuses to move forward, if she gets in, she will back right out again before you can get her securely in and doors closed. Nothing has happened to scare her, she just seems to have gotten progressively worse. At first, she was fine, then only if another horse was loaded first, now it doesn't matter. Any suggestions or tips would be greatly appreciated.