Why does my dog get so nervous everytime I cook?

My dog Lily gets very nervous and anxious every time I cook. She stands at the entrance of the kitchen (but won’t come in) and watches me nervously. If I acknowledge her behavior by saying “relax Lily, I’m just making food” for example she will usually back out of the door and go upstairs to hide. At first I thought it was because she could smell smoke and thought there was a fire. Then I realized she does it even when there is no smoke at all, like when I use the microwave. She is scared of the smoke alarm. Do you think she is just nervous that it will go off from cooking?

Also, Lily is a very sensitive and gentle dog. I’m not sure why but she responds to subtle things, like when someone is feeling sad. Maybe her sensitivity to things makes her nervous from cooking even if there is no reason to be?