Do i keep doing things as usually and act like nothing is wrong? We had a rain storm yesterday and she doesn't like the rain and will not go to the bathroom so me and my wife where out there with chicken treats doing some basic training and she could care less about the rain.
Yes keep acting calm and nonchalant, then do what your wife did. Do a little training while the the scary thing is happening until she starts to forget the scary thing is all that important.
For cars, stand further back from the road, then make her sit and focus on you. When she can do that well, let her look at the car as it goes by and have her focus back on you. You want her to be able to look at the scary car going by, but then be able to disengage and look back at you. Gradually move her closer. Do that and she'll eventually learn that cars stay glued to roads and aren't going to run her over every time one goes by. That's ultimately why she's scared: cars are giant, fast-moving, and loud. They must look like horrific eldritch beasts coming to eat her.
Dog barks are a little harder because you can't predict them. I think I'd try to make her sit every time a dog barks, or some other command that forces her to think for a second.
The vacuum. Jack hated and feared the vacuum, too. We first put the vacuum in the middle of the living room and let him smell it, bite it, climb all over it while rewarding him for exploring the giant weird thing. Then we'd quickly turn it on and off so it'd make a sound, then walk away from it so he had time to investigate the vacuum again. He got rewarded for returning to investigate the vacuum, even if it was very cautiously.
When we had to do real cleaning, we just put him upstairs in our bedroom while once of us vacuumed and the other played with him. It allowed him to get used to the sound on a sustained level. Once he was around 5-6 months, we let him watch the vacuum moving around from a distance. And on and on and on until he stopped barking and running away in terror from the thing. He still hates it because it's loud, and remains suspicious of it anytime it approaches him. But he doesn't cower or anything. He just moves out of the way while glaring at it.