If she has got worse recently, it might be worth getting her checked out with the vet in case she has an underlying health problem that is making her extra nervy/sensitive to noise. But failing that, it might just be a fear issue. You are doing right not to fuss her when she is upset, as that will be interpreted as praise for being frightened, so ignoring apart from treats is the best way.
An animal behaviourist friend once told me that dogs don't learn when they reach a certain 'stress threshold' so what you have to do is to introduce them to things at a point where they are able to cope, and then as they adjust to that, you can increase the proximity/noise level or whatever. For example, my dog was terrified of cars to the point where she was out of her mind. I started walking her on a loose lead a field away from the road, giving her lots of favourite treats. Gradually, we started moving across the field, then onto the road, and she is now ok jumping into cars but still unhappy with being driven.
You could try getting your OH to sit with Gracie in another room with the door shut, feeding her cheese while you operate the whisk. (If she is too stressed to eat, she is too stressed to learn, apparently) If she is ok with that, then try with the door open, then moving nearer the door, into the kitchen etc. It is really important to take the stages slowly as if she is pushed too far and panics, it will set her back.
This has helped my dog with loads of issues, although some have taken longer to get used to than others. I picked the one that was causing her most stress, work on that until she was ok, then move onto the next, so she is not dealing with too much at once. Hope this helps!
Oh, and try (easier said than done!) not to stress about her too much yourself, as she will pick up your anxiety!