Could there be anything other than something visual that is causing your dog to be stressed, such as sounds coming from an object, scents from paint or candles, etc.?
It's important to keep in mind that when a dog is stressed, petting and talking to the dog can actually reinforce to the dog that "it's okay for me to be stressed because she's rewarding me by giving me attention". In a lot of cases, it can actually cause the dog to become more stressed as well. As humans, we like to hug and console when people are down or stressed, but in the dog world it's different. Also, forcing her to go into an area she's scared of can become a very tramatic experience for her.
Something you can try is to get her to build a good association with whatever is making her nervous. When she exhibits this behavior, toss a small piece of treat just outside the doorway (not in the room just yet). If she doesn't get close to it, try moving the treat closer to her and figure out what her comfort zone is. She may go to get the treat and back up again, which is okay. Do it several more times. Slowly, you can start to move the treat closer to the doorway, then just inside the doorway, and then inside the room. Make sure you do this incrementally. This exercise will allow her to go into the room on her own AND she'll get a yummy treat. Try to give her a treat that's very high value. Instead of biscuits, try small pieces of hot dogs (the cheapo ones can work great), cooked chicken, or even liverwurst. Dogs LOVE liverwurst!
In the meantime, the next time your dog displays this behavior, take note of anything that might be the slightest bit different - was there previously a visitor in the room that made her feel uncomfortable, did you burn a particular scent of candle, we're you hammering a nail into the wall, etc. Also, when she is going in and out of the room without hesitation, make note of what happens when she leaves the room. Were there any aversive sounds she may have heard, was there an object that she may have stumbled over, etc. Dogs are constantly making good and bad associations with things and unfortunately since they don't speak English, it's up to us to play a sometimes frustrating role of detective.
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Grace
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