Just act completely normal, as though she isn't spooking; if she knows and trusts you, she will see that you have no reason to be scared and will hopefully get over it. If you come across that sort of thing often she will have no choice but to get used to it! Try hacking in company for a bit cause horses are often spookier when on their own. Don't let it get to you, all horses have their faults and you sound so lucky to have a horse so perfect that that's her only fault! My mare was mistreated when she was younger and now rears and tries to get me off when she's in an open grassy area, so I can't take her to hunter trials or on the moors and whatnot :@ Hope that helped

Lizzie-Ellen xxx