Always keep in mind horses are prey animals. They have evolved over the course of millions of years being on the menu. Horses like open areas where it's more difficult for a predator to be concealed, and they get eyebally/lookie looey in woods and near structures that can hide a predator (Old cellars with no door on it, hunting blinds, ancient abandoned barns, etc.).
Also keep in mind they can smell predators and where they've been, and will be on high alert/nervous. Yes, your horse knows something you don't and it worries her. In a group setting, they will feed each other's fear, worry, concern, and alertness - because that's how the herd survives. Horses will all try to look at what that first horse notices and goes on 'point' about. Like other riders, this is how I see 99% of the wildlife on our rides. I look where Trigger is looking.
There's only so much you can do about her discomfort with the woods and outdoors in general, because that's a horse for you. They're always expecting something to try to eat them. It's instinct. If she's a lone horse, those concerns are going to be magnified because there isn't a second or third or fourth (etc) set of eyes on watch. She may not relax much at all, ever, for this reason - in a herd setting, some horses will relax and lay down, take a nap, sleep on their feed, graze without concern because there are other horses on their feed, on guard/look out for threats. Without a partner to take turns on decompressing, she may stay keyed up.
She's smelling the predators on your place, and she's probably seen them and heard them personally, while you're experiencing just the images from a game camera. The night time is probably especially scary for her.
I'd recommend a pasture donk as a companion, or a second horse.
"We are here to laugh at the odds and live our lives so well that death will tremble to take us."